Amazing O2 housing

[ItsStockOfficer]

Originally posted by MNGSX
Actually it looks ok... I just think there are better ways to do it.


Can you MIG and TIG weld?


I can

Mild steel, Stainless, Aluminum... No problem.


I just don't understand why it is so damn hard for you to grasp that WG flow increases can make power.

It's a basic concept that decreasing restriction of exhaust flow creates gains. So If you increase flow tru the wastegate you can increase power.

It's like saying catbacks don't make power they just lower backpressure.

A wastegate that can flow more exhaust lowers backpressure between the turbine and the head better. Less backpressure = more power. A larger gate or a better flowing one can bypass more exhaust around the turbine. So if you are at full boost and you have alot more exhaust gas flow than what is needed to maintain that boost level you can run a lower exhaust manifold pressure.

How can a external wastegate flow more air out of it and run the same boost as an internal wastegate?

It can't.

If your running 20 PSI and you have to vent 20% of your air to do so, then you hafta vent that much air no matter whats doing it. If an external flowed more, it would RUN LESS BOOST.

 

[ItsStockOfficer]

Originally posted by boostedinaz
I dont want to hijack but just bought an RNR 3inch O2 elim back exhaust. I put it on and and t fits great. My only problem is I get some creep with it. I am still on the 14b for now until I get injectors then I can safely put my 20G on. I am wondering if it is just something I will have to deal with for now or if I can fix it. I dont want to pull the turbo becasue I will be doing that to put the 20G on and dont want to do it twice. I am guessing that the flapper and hole are the big restriction now as opposed to the exhaust and that why it creeps. Any suggestions would be great. Here is a pic of my O2

Michael

Put on the 20g. Run 14 PSI. I did, it ran fantastic on 450's.

 

[coltboostin]

the only gain you will see from increased wastegate flow is if you dump into the atmosphere, keeping the turbulence of the wastegated exaust gases out of the exaust stream. Otherwise, the wastegate serves one purpose, boost control.

JDM, nice informative come back, you da man!

 

[jdmawd]

These guys are offering a bolt on mitsu o2 housing. With show quality craftsmanship at a reasonable price. The new DSM fad is Gigantically insane unnecessarily sized turbos. And shitty HP numbers and times.

Out of all the BS you don’t need. This is a part that you actually do. Give your 4500-rpm spooling 300whp 12 second 56 trim gt40. A part that you will actually benefit from.

I don't know if I like the bends on the wastegate pipe. They look a little sharper than some. Also the WG port on the housing is'nt round. So the pipe should'nt be round at the mount nor should the hole in the flange. Think port matching.

This affects controlling compressor speed exactly how?

I just don't understand why it is so damn hard for you to grasp that WG flow increases can make power

bwhahahah are you insane!!!! A wastegate controls compressor speed. Nothing more, as long as the dump location is not introduced directly in the path of the exiting exhaust stream of the turbine. It will not affect Hp flow or anything else.


Good Luck.

 

[NOSLO2PT0]

Originally posted by jdmawd
The new DSM fad is Gigantically insane unnecessarily sized turbos. And shitty HP numbers and times.

Speaking of which, we are still waiting for YOURS!!!

 

[jdmawd]

Originally posted by NOSLO2PT0
Speaking of which, we are still waiting for YOURS!!!

still dont know who *we* is

 

[Skeletor]

Forced Performance has also put down 550whp on a 2.5" housing as well. Robert says you dont need to upgrade to a 3" housing until your turbine wheel measures over 2.5". Take it for what it's worth.

Don't get me wrong here, I know that 2.5" 02 housings can support a ton of power. I had one on my old car and I made plenty of power with it. However, I am just arguing with the fact that it is a bad thing to run a 3" o2 housing. Someone surely wouldn't lose power using one.

 

[coltboostin]

I was thinking abotu it, and according to MNGSX's theory, a 34mm wastegate flapper wpould increase HP.

Well I guess I sould sell this 3ich O2 housing and find me someone to make a 80mm flapper so I can have insane power!!!!

Not trying to start a war, just want to show you the light

 

[ItsStockOfficer]

Not needing something and having it be a benefit are totally different. Turbos work off of pressure differentials. The lower pressure it on the turbine side, the better

Sean

 

[MNGSX]

Originally posted by jdmawd


bwhahahah are you insane!!!! A wastegate controls compressor speed. Nothing more, as long as the dump location is not introduced directly in the path of the exiting exhaust stream of the turbine. It will not affect Hp flow or anything else.

Is Hp flow a technical term? I think not.

My main point is that a 3" o2 probably won't make more power than a 2.5" tapering to 2.75"

Also that larger wg tubes make for a better flowing gate which will decrease the chances of boost creep as it can bleed more manifold pressure off.

It can indeed make a HP increase. Yes it's primary purpose is to control compressor speed. The point is that sometimes you need to be able to flow more air out a gate with some turbos because the exhaust manifold pressure is above what is neccessary to maintain that boost level.

Why do you think that many people recomend an external gate with a 20g?

Some turbos may respond no different while others will take a shine to it. It depends on the turbo.. A tight turbine housing 6cm^2 with a big comp wheel would definately make more HP with a better flowing gate. A larger turbine housing 8cm^2 with a midsized comp wheel may not just because their is already not that much pressure between the turbine wheel the head in the manifold. Exhaust manifold pressure a technical term...

It's probably another minor gain. On a back to back Dyno the difference would be only 2-10hp with most turbos and only in upper RPMs where the gate has to be held open to keep boost in check.. Lets say you set boost at 20 psi. You might see some creep at upper rpm so it really peaks at 22-23. A better flowing gate will eliminate the creep keeping exhaust manifold pressure at the minimum needed to maintain 20psi.

The main points are that increasing flow is the goal and not mearly pipe size. Like a 3" mandrel downpipe VS a 3" press bent for example. Or with cylinder head porting or intake runner length. Matching the turbine wheel exducers bore and expanding to match the downpipe is the best way for flow. I'm probably more tweeked than anything that the aftermarket has'nt done it. Everything I have learned about the physics of gas flow tells me that a tapered o2 matching the outlet bore and expanding to a 3" bore will blow away an EVO housing. The 3" will beat it too but the tapered housing will be 10hp above the 3".

With the gate the HP gains are minimal in most cases and with smaller turbos or those with really open turbine housing A/R's the gains are academic. However, anything done to decrease pressure on the backside of a gate and increase the flow thru the gate will make boost eaiser to regulate.

You have an FP 30 right? Don't you think Robert knew what he was doing when he decided to match the turbine outlet diameter with that V band then expand to full exhaust system diameter?

 

[ItsStockOfficer]

Originally posted by MNGSX
Is Hp flow a technical term? I think not.

My main point is that a 3" o2 probably won't make more power than a 2.5" tapering to 2.75"

Thats not true. Period. But it's nice how here you say it might, and later you claim iot definitley will, with mythical imaginary dyno numbers for back up....

Also that larger wg tubes make for a better flowing gate which will decrease the chances of boost creep as it can bleed more manifold pressure off.

This is elementary.

It can indeed make a HP increase. Yes it's primary purpose is to control compressor speed. The point is that sometimes you need to be able to flow more air out a gate with some turbos because the exhaust manifold pressure is above what is neccessary to maintain that boost level.

Please explain moving the wastegate flapper can affect the manifold pressure nessecary to run a given compressor boost level. Im afriad I don't understand how a external wastegate, which does the exact same thing as an internal can magically make your turbo run the same boost at a lower exhuast mani pressure.

Why do you think that many people recomend an external gate with a 20g?

They're creep prone, no more and no less.

Some turbos may respond no different while others will take a shine to it. It depends on the turbo.. A tight turbine housing 6cm^2 with a big comp wheel would definately make more HP with a better flowing gate. A larger turbine housing 8cm^2 with a midsized comp wheel may not just because their is already not that much pressure between the turbine wheel the head in the manifold. Exhaust manifold pressure a technical term...

Get off drugs and stop blathering about aspects of turbo chargers you don't understand, for ####'s sake, you think a comp wheel has something to doo with turbine flow.

It's probably another minor gain. On a back to back Dyno the difference would be only 2-10hp with most turbos and only in upper RPMs where the gate has to be held open to keep boost in check.. Lets say you set boost at 20 psi. You might see some creep at upper rpm so it really peaks at 22-23. A better flowing gate will eliminate the creep keeping exhaust manifold pressure at the minimum needed to maintain 20psi.

Allwere discussing now is that you need a external sometimes to control boost, No one here will argue with it, but they still don't make power at a given boost level, retard. You just said the stupidest point int his entire thread, its like your arguing with yourself. All you said was that at the same boost level, unless there is creep, its the same.

And NO, back pressure between the head and turbine CANNOT increase on a internal and stay the same on an external and run the same boost level.

The main points are that increasing flow is the goal and not mearly pipe size. Like a 3" mandrel downpipe VS a 3" press bent for example. Or with cylinder head porting or intake runner length. Matching the turbine wheel exducers bore and expanding to match the downpipe is the best way for flow. I'm probably more tweeked than anything that the aftermarket has'nt done it. Everything I have learned about the physics of gas flow tells me that a tapered o2 matching the outlet bore and expanding to a 3" bore will blow away an EVO housing. The 3" will beat it too but the tapered housing will be 10hp above the 3".

So prove it. And don't ####ing pull magic numbers out of your ass. You useless techno-babble proves nothing and your spouting off potentially meaningless theory. about an o2 housing you could never build, since there is now way to create a smoth tapered increase with a 3 inch raduis'ed bend.

With the gate the HP gains are minimal in most cases and with smaller turbos or those with really open turbine housing A/R's the gains are academic. However, anything done to decrease pressure on the backside of a gate and increase the flow thru the gate will make boost eaiser to regulate.

Stop repeating yourself. Yes, in some case an external is nessecary to regulate boost, this has nothing to do with power output assuming the internal works well, which many do. There are no power gains and a given boost level with an external gate.

You have an FP 30 right? Don't you think Robert knew what he was doing when he decided to match the turbine outlet diameter with that V band then expand to full exhaust system diameter?

He did it for convience, and I dont think anyone has a evenly tapered o2 housing off of it in existence. You're wrong.

Sean

 

[MNGSX]

I give up... Even you said it but just apparently want to argue

Originally posted by ItsStockOfficer

The lower pressure it on the turbine side, the better
[/B]

Originally posted by ItsStockOfficer


Please explain moving the wastegate flapper can affect the manifold pressure nessecary to run a given compressor boost level. Im afriad I don't understand how a external wastegate, which does the exact same thing as an internal can magically make your turbo run the same boost at a lower exhuast mani pressure.
[/b]
[/B]

It does'nt change the pressure necessary to run a given boost level.. I never said that. You can run into situations where you have more than the required flow to maintain the boost level and a bit better flow out the gate would be helpfull. The only mistakes are the words you are putting in my mouth.

Originally posted by ItsStockOfficer

[/b]
Get off drugs and stop blathering about aspects of turbo chargers you don't understand, for ####'s sake, you think a comp wheel has something to doo with turbine flow.

[/B]

Listen pud smacker.. I have never done drugs of any kind and before I got fed up with the politics and BS part of my job actually consisted of testing evidence via a kit for admission as drug evidence.

Yes a comp wheel has something to do with turbine flow. What goes in the intake manifold comes out the exhuast. :laugh: Talk about not knowing about turbos. A bigger comp wheel puts more air into the engine therfore there is more exhaust flow which has alot to do (not doo) with turbine flow.

Originally posted by ItsStockOfficer

Allwere discussing now is that you need a external sometimes to control boost, No one here will argue with it, but they still don't make power at a given boost level, retard. You just said the stupidest point int his entire thread, its like your arguing with yourself. All you said was that at the same boost level, unless there is creep, its the same.
[/B]

Holy tardbonics battman! :laugh:

I think you mean all we are discussing instead of "allwere"...

How is the point that eliminating creep is a good idea a stupid point? Also since the wastegate does'nt flow anything unless open why does it suprise you that I said that the difference only shows up when the wastegate is in operation. Thats extremely elementary.

Originally posted by ItsStockOfficer

And NO, back pressure between the head and turbine CANNOT increase on a internal and stay the same on an external and run the same boost level.
[/b]

Umm no sh%t sherlock. Yes a exhuast manifd pressure increase will create a boost pressure increase.

Instead of saying external vs internal lets just look at the factor of wastegate flow. Lets say we have one that flows alot and does'nt creep vs one that does creep. The extra few PSI of creep runs particular turbo at a less efficient output. So you may have gained PSI but are loosing power to efficiency losses. The other gate runs at the set PSI exactly so you have better induction and less exhaust manifold pressure at the same time.

My main point has always been that going right to 3" at the turbine is'nt as good as matcing the turbine diameter and that improving the wastegate side does make gains.. Mostly boost control is improved and in many cases more reliable boost control will help power output.

Originally posted by ItsStockOfficer

So prove it. And don't ####ing pull magic numbers out of your ass. You useless techno-babble proves nothing and your spouting off potentially meaningless theory. about an o2 housing you could never build, since there is now way to create a smoth tapered increase with a 3 inch raduis'ed bend.
[/B]

As for proving the potential power gains I dont have the kind of budget or free time to do my own back to back dyno test with different wastegates.

I think ample evidence that boost creep sucks and a wastegate that flows well works well and is preffered.

It has been proven that matching the turbine outlet and expanding from there is better and garret has done the testing to back that up.. Which you already admit so that is documented. It is also documented that a wastegate that can bleed off enough exhaust gas is better. So the right size turbine outlet pipe leaves just enough room on the flange for the right size and shape wastegate pipe. Sounds like a better design to me.

Originally posted by ItsStockOfficer

He did it for convience, and I dont think anyone has a evenly tapered o2 housing off of it in existence. You're wrong.

Sean [/B]

He did it because it was the right way to do it. In your own words

Originally posted by ItsStockOfficer

3 inch is better, true, but Garret engineers do state the 7* spec, and they have done the testing to back it up.
[/B]

True even his pipe is'nt mandrell bent and tapered. It's welded bent sections of increasing diameter. Its much closer to a 7* taper than anything I have seen and much better than just having a 3" pipe on a t3/t4 flange plate sitting on top of a 2.5" exducer. His design is as close as you can get without your own in house mandrell bender. Equipement does exist which can create a tapered mandrell bend.

I am building an O2 housing to my specs. I have looked things over enough to know how to pull it off. It is'nt the lab test outlet of that a garret engineer said was optimum but It's as close as you can get and still bolt up and clear in the car.

 

[ItsStockOfficer]

Originally posted by MNGSX
Blah blah blah, attack your typing, go back on shit I said, don't make sense blah blah

A larger wastegate cannot make power, period, All a wastegate does is control boost. You have been stating shit to the contrary of that this entire time.

"It can indeed make a HP increase. Yes it's primary purpose is to control compressor speed. The point is that sometimes you need to be able to flow more air out a gate with some turbos because the exhaust manifold pressure is above what is neccessary to maintain that boost level."\

If the exhaust manifold pressure was higher, then you would be at a higher boost. Exhaust mani pressure can only be at the nessecary pressure to run the boost its running and thats all that matters.

You have repeatedly made stupid and outrageous claims about larger w/gs making more power at the same boost level, and you're an idiot for it.

 

[MNGSX]

Originally posted by ItsStockOfficer
A larger wastegate cannot make power, period, All a wastegate does is control boost. You have been stating shit to the contrary of that this entire time.

If you can control the boost better keeping the turbo more centered in it's efficiency island you make more power therefore in some instances it will make more power.

Any exhaust manifold pressure that is'nt needed to feed the turbo is bad. Peroid. Like I said some turbo setups will see no gains at all because the gate can flow what it needs to on others the elimination of creep will help. The HP involvement is very minor but a better working gate is always better.

I think I will give up on you. Obviously reading comprehension is'nt one of your strong points.

FP
No compromise in power was measured with the 2.5” unit over the 3”, 540whp at 27psi has been recorded with the 2.5” housing[/B]

http://linux.forcedperformance.net/...oduct_Code=O2FP3025&Category_Code=DSM-Exhaust

Therefore my point about the pipe diameter here is proven.

As for the wastegate just look at any turbo that can creep and how far the efficiency drops during creep or spikes. Then look at the efficiency when it is ran at the most efficent pressure ratio without creep to knock it out of the sweet spot.

Oh and you gain hockey helmet points for making really stupid comments in the quotation box.

 

[ItsStockOfficer]

No, your claim had nothing to do with spike or boost control. You said a larger wg made more power at the same boost. Period. And you were ####ing wrong.

 

[GunnerTSi]

Originally posted by coltboostin
the only gain you will see from increased wastegate flow is if you dump into the atmosphere, keeping the turbulence of the wastegated exaust gases out of the exaust stream. Otherwise, the wastegate serves one purpose, boost control.

JDM, nice informative come back, you da man!

This cannot be the same JDMAWD that used to post all over MACH V, holy crap I'm actually thinking along the same lines as you. hahahaha.

 

[GunnerTSi]

Originally posted by jdmawd
These guys are offering a bolt on mitsu o2 housing. With show quality craftsmanship at a reasonable price. The new DSM fad is Gigantically insane unnecessarily sized turbos. And shitty HP numbers and times.

Out of all the BS you don’t need. This is a part that you actually do. Give your 4500-rpm spooling 300whp 12 second 56 trim gt40. A part that you will actually benefit from.






This affects controlling compressor speed exactly how?



bwhahahah are you insane!!!! A wastegate controls compressor speed. Nothing more, as long as the dump location is not introduced directly in the path of the exiting exhaust stream of the turbine. It will not affect Hp flow or anything else.


Good Luck.

Damn, I meant to quote this reply. That's what Fat Tuesday and a bottle of 1800 will do to ya.

 

[MNGSX]

Originally posted by ItsStockOfficer
No, your claim had nothing to do with spike or boost control. You said a larger wg made more power at the same boost. Period. And you were ####ing wrong.

Way back on the first page I said.

A wastegate that can flow more exhaust lowers backpressure between the turbine and the head better. Less backpressure = more power. A larger gate or a better flowing one can bypass more exhaust around the turbine. So if you are at full boost and you have alot more exhaust gas flow than what is needed to maintain that boost level you can run a lower exhaust manifold pressure.

Nowhere in this thread, this forum, any other car forum, any emails, pm's or AIM's have I ever said "a larger wg made more power at the same boost level"

A better flowing gate works better so I am talking about a wastgate tube which is port matched to the flappers cavity in the turbine housing. I never mentioned flapper size. Matching the cavity allows flow around the flapper which exhaust gas has to flow around to get to the tube.

Turbine wheels are actually driven by the force of the exhaust gas not pressure alone. The constriction of the turbine nozzle and housing directs this force to the wheel. Pressure does mean that the gases are pushing the wheel but there is also the effect of just the nozzle. Like a garden hose nozzle which is'nt spining anything in its bore but increases pressure just the same.

Alot depends on the housing, wheel and exhaust flow but in some cases decreasing manifold pressure does'nt lower boost much at all therefore increased power. Since turbine wheels like comp wheels have their own efficiency range diverting say 2% of exhaust flow out the gate might not decrease the turbine shaft speed even 1/2 of 1%. Spinning a comp wheel faster is'nt always better which most of us know from compressor maps. Yet within the efficiency range of that wheel a higher shaft speed translates to more power.

Back to the hotside.

Just because you have more exhaust gases trying to shove thru the turbine housing does'nt always mean that the turbine wheel is turning any faster since it has its own efficiency range. It gets complicated as hell. Now I'm going to say it in some cases you can indeed make more power at the same boost level with less exhaust manifold pressure.

What about clipped turbine wheels don't they decrease exhaust manifold pressure at a given boost level? Opening a gate is a bit like cliping a turbine wheel or a more open A/R. It depends on things like the wastegate actuator tension and the type of boost control as well. Some systems alow the gate to gradually open where as some just open it fast once enough intake pressure has been reached.

http://www.dsmtuners.com/forums/showthread.php?s=&threadid=65811&highlight=Turbine+Map

Others reading along ignore all the stupid banter but keep this in mind.

1. 3" right at the turbine outlet is NOT needed 2.5" is proven to be just as good. An o2 housing is best if it tapers to match the downpipe diameter.

2. The wg tube where it meets the housing should match the port shape for best gate performance.

In a nutshell. Starting at 3" gains nothing and does'nt leave room for a proper wg tube. Therefore you GAIN NOTHING over a 2.5" tube at the expense of optimum wg operation.

 

[jdmawd]

Originally posted by MNGSX
Is Hp flow a technical term? I think not.
You have an FP 30 right? Don't you think Robert knew what he was doing when he decided to match the turbine outlet diameter with that V band then expand to full exhaust system diameter?

Good call and who said HP flow was a technical term? Since you asked what I think, I will tell you. All this 02 housing chatter is annoying to read. I think the 02 housing being discussed is better then any of the 2.5" internally dumped hack jobs I have seen thus far.

Wastegate location will not affect hp in any way. The wastegate regulates compressor speed, in order to maintain a given max boost level. As long as the wastegate dump location is not reintroduced to close to the turbine exit. Which can cause turbulence in the exhaust flow. Gate location makes zero difference.

In conclusion

The internally gated 3" o2 housing being discussed on this thread will flow more, spool the turbo quicker and ultimately lower average EGT's with no other changes.Then any 2.5" comparable offering.





EDIT

BTW here is the FP version of the radius 3" 02 used on the 30's looks like its 3" on both ends.

You must be logged in to view this image or video.

Good Luck.

 

[ItsStockOfficer]

Originally posted by MNGSX
A wastegate that can flow more exhaust lowers backpressure between the turbine and the head better. Less backpressure = more power. A larger gate or a better flowing one can bypass more exhaust around the turbine. So if you are at full boost and you have alot more exhaust gas flow than what is needed to maintain that boost level you can run a lower exhaust manifold pressure.

I didn't even read your entire post, it was to idiotic, because this statement is always wrong. I know you blabber something about turbine effciency, but it simply doesn't apply. If you raise exhaust manifold pressure, boost goes up. It may not quite go up in a linear fashing, but effciency never drops faster then exhaust mani pressure raise's speed. It may drops a few percent for every few thousand rpm's gained. Not even worth discussing. In terms of being able to not affect boost, its not worth discussing

You're completely wrong.

Clipping is nothing like opening a WG more. Its like changing the turbine wheel. Not vaguely related becuase it alters the characteristic of the turbo itself. never said it takes the same mani pressure to run the same boost on every turbo charger. DUH. Worlds second stupidest point.

3 inch makes more power then 2.5. And 3 inch leaves a ton of room for a wg tube. Hahns been doing it for 8 years....RNR has over 800 on the market that do it great.

 

[DSM90AWD]

Originally posted by ISUJakey
I consider this O2 housing to be rather impressive also if you don't want to pay quite the price of the Shearer Motorsport model: the QPR

You must be logged in to view this image or video.

This looks interesting.. but wouldn't it interfere with the PS pump?

Didn't Dre put down 505 WHP on pump with an AGP T3/T4 kit which uses a 2.5" O2 housing?

 

[MNGSX]

BTW here is the FP version of the radius 3" 02 used on the 30's looks like its 3" on both ends.
[/B]

BTW that is'nt a fp30 if it is it is the first one I have seen without a v-band attatchment for the downpipe.

Does that turbine housing look anything like this one? No it does not.

You must be logged in to view this image or video.

You must be logged in to view this image or video.

This is the 3" o2 for a FP30. I know because it f7cking says "Custom 3" SS O2 Housing for FP30 Turbo"

If you think this one starts at 3" you are definately on something.

Now look at the 2.5"

This 2.5” 304 Stainless Steel Oxygen Sensor Housing allows boltin fitment of the the FP30 Turbochargers while retaining your existing 2.5” or 3” standard aftermarket DSM Downpipe.

No compromise in power was measured with the 2.5” unit over the 3”

540whp at 27psi has been recorded with the 2.5” housing. It comes complete with O2 sensor bung and v-band clamp. Dump tube for WG is optional.

 

[jdmawd]

Originally posted by MNGSX
BTW that is'nt a fp30 if it is it is the first one I have seen without a v-band attatchemnt for the downpipe.

Wow you sure don't miss much do you champ. Lets try this again, that is a picture of the FP 3" radius 02 housing used on the 30's but flanged for a mitsu application. I assumed since this was a thread about 3" mitsu flanged 02 housings that was understood.

 

[jdmawd]

Originally posted by MNGSX
BTW that is'nt a fp30 if it is it is the first one I have seen without a v-band attatchment for the downpipe.Does that turbine housing look anything like this one? No it does not. This is the 3" o2 for a FP30. I know because it f7cking says "Custom 3" SS O2 Housing for FP30 Turbo"

If you think this one starts at 3" you are definately on something.

Hey Genius i own that 3" Vband o2 housing, i am aware of how its constructed.

 

[jdmawd]

Originally posted by DSM90AWD
This looks interesting.. but wouldn't it interfere with the PS pump?

Didn't Dre put down 505 WHP on pump with an AGP T3/T4 kit which uses a 2.5" O2 housing?

Although I don't know dre personally. Im pretty sure his car has a 3.5" exhaust system. I seriously doubt he uses a 2.5" o2 housing.