o2+downpipe question

[Ottoman]

Hey guys,

I'm piecing together my exhaust system.. and have a small question.

I have an elipser 80mm catback exhaust..

and an External Dump ported 02 Housing that i bought used off the ads...

I want to buy a Downpipe for the car to complete the exhaust

How can I tell which Downpipe i need? According to RRE there's the regular Downpipe, and the upgraded Evo Downpipe which has a little diff bend in it.....


is there any visual way for me to find out which DP i need?


Thanks

 

[brute]

Well you only need the Evo downpipe if you have an Evo III o2 housing. People have had troubles with the Evo III o2 housing matching up with their stock exhaust. So you don't need this one. Do you have a cat? Do you want to keep your cat? Because you can get downpipes that completely eliminate the cat and bolt up straight to your catback. Or you can get a high-flow cat and have a downpipe that's a little shorter bolt up to the cat.

Here's a little drawing:

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[S_Ranger]

Well make sure you get the FWD downpipe. What's the diameter of your 02 housing? You can always get 3 and have it welded on.

 

[Eastwood95]

if he lives in asia, there's probably no emissions testing so no need for a cat...........
Get a downpipe that is labeled "cat eliminator"........also, you need to get a downpipe that matches the flange of your "elipser"..........or find an exhaust shop to match the flanges of your downpipe and catback.

You did it the hard way, and you will probably have to get a custom weld job somewhere in the mix. Unless you want to buy a complete "turbo back" new exhaust.

www.extremepsi.com

check them out, they have some good exhaust deals for 2G dsm's.........

 

[brute]

I believe he means the Espelier exhaust that Road Race sells. It is a 2-bolt universal exhaust flange, so even if the downpipe doesn't come with one of those flanges (which it more than likely will), any decent exhaust shop can chop/weld it on.

 

[Ottoman]

thanks for the replies guys,

I meant Espelier... brain fart...

I'm fully of aware of the Cat vs Catless.. that's not the problem...

what i meant was....

How can i tell if i have an EVO 02 housing or a DSM o2 housing..

it's aftermarket.. but i don't know what it is... there's no branding on it...

 

[blackbyrd]

There's no marking for it?
My evo III says 3k06 848.
Do you mean its an aftermarket evo III, or stock evo III..
The best way to tell is the angle of the 02 to downpipe flange is at a couple degrees more of an angle then stock (TELs). Which would be why you'd need a proper flange to bolt it on.

 

[jumpfroggy]

There's no marking for it?
My evo III says 3k06 848.
Do you mean its an aftermarket evo III, or stock evo III..
The best way to tell is the angle of the 02 to downpipe flange is at a couple degrees more of an angle then stock (TELs). Which would be why you'd need a proper flange to bolt it on.

I think he means that it's an aftermarket o2, but he doesn't know if it's evoIII style or normal style. The obvious answer is to ask the people who made it. Are you sure the name is "External Bumpe"? Is that a typo? Any other markings on the thing?

Good luck.

 

[Ottoman]

I think he means that it's an aftermarket o2, but he doesn't know if it's evoIII style or normal style. The obvious answer is to ask the people who made it. Are you sure the name is "External Bumpe"? Is that a typo? Any other markings on the thing?

Good luck.

EXACTLY.. finally someone understands my question..

Unfortunately.. I purchased it USED from the ads..
the person i bought it from is not being responsive to my mails...

yes that was a Typo.. i meant "External Dump"... i.e. the wastegate is routed to the atmosphere...


i did notice some numbers cast into the iron.. but no Brands to distinguish it...

 

[jumpfroggy]

I've been reading about the differences too, and from what I can tell the difference between the evo and the stock (besides internal performance) is the angle of the outlet flange, and possibly the slots where it bolts up. Since the outlet is angled differently on the evo o2, normal downpipes will be at the wrong angle.

I really don't know, but I'd guess most aftermarket dsm o2's would be stock-angle, not evo3 angled. Hit or miss, really. I don't know of any way to test it besides comparing the two. Do you have the stock? If it's off the car, you could put them side by side and see if they're angled differently and if the bolt holes line up.

From roadraceengineering.com:
"If you have the upgraded EVO O2 sensor housing, order the EVO style DP. It comes with the larger EVO bolt pattern and is angled correctly for those cars running the EVO O2 housing"

So yeah, larger bolt pattern and different angle. Can you borrow a friend's o2 to compare?

 

[Ottoman]

thanks for the reply..

but the thing is .. I live half way around the globe.. I don't really wanna order the wrong one pay all that shipping and then discover it doesn't fit...

see.. the housing is Cast iron.. that's been modified into an External Dump...

which makes me wonder if it originally began life as a Evo 02 housing or not..

i've included some pics...

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[Ottoman]

just wanted to add...

do most ppl's downpipes Neck down at the stock cat side? like the megan ones?

do most ppl just chop it off and go 3".. or is it not worth the hassle for that little bit?

 

[jumpfroggy]

I'm curious about that too. I'm looking to find a 2.5 downpipe, but it seems most of them are 2.5 to 3" piping to 2.5 again. Is this any different (better/worse) than just having a 2.5 pipe all the way through?

For you, ottoman, I feel like there's something else to it too. If you're getting a cat-eliminator downpipe, then the 2.5 outlet would hook up to your exhaust/catback. If you kept the last 2.5 flange, then your catback would have to start at 2.5. That may limit your exhaust options. If you went with a 3", it'd be funny to have it start at 3, neck down tot 2.5, then go back out to 3. In the end, I wonder if it matters.

Me? I'd be happy to just find a good 2.5 downpipe and exhaust system and leave it at that.

 

[Eastwood95]

Some people just buy a turbo back catless system that doesnt neck down. Some people try to run the stock cat with an upgraded downpipe and catback(which doesnt make sense to me), and some people(me included) fabricate a turbo back system and buy the parts separately(downpipe, flanges, flex section, muffler) and get a shop to weld it all together. If you're already dumping your wastegate to the atmosphere, i'm guessing emissions dont bother you. You could buy an aftermarket downpipe and get it custom fitted to your rear section with NO CAT. Are there any custom exhaust shops where you live?

 

[Ottoman]

Some people just buy a turbo back catless system that doesnt neck down. Some people try to run the stock cat with an upgraded downpipe and catback(which doesnt make sense to me), and some people(me included) fabricate a turbo back system and buy the parts separately(downpipe, flanges, flex section, muffler) and get a shop to weld it all together. If you're already dumping your wastegate to the atmosphere, i'm guessing emissions dont bother you. You could buy an aftermarket downpipe and get it custom fitted to your rear section with NO CAT. Are there any custom exhaust shops where you live?

I have a true 3" turbo back exhaust on the way...

i'm most likely going to buy one of those megan Downpipes and have the bit chopped off and matched to the catback.. that's not really my concern..

what i'm conerned about.. is that the megan is made for a regular o2 housing.. and if mine is an evo one.. the whole downpipe will be useless due to the differing angle... and i'll be stuck with it... (shipping this far aint cheap either)

 

[fourreGsixty3]

I think the easiest way for you to figure out if its a reg DSM style o2, or an EVO o2 is bolt the o2 up to your turbo, then bolt up your stock DP, if it has no fitment issues it is a DSM style o2, or the DP cant bolt up then its an EVO o2. Also do you know if the kid you bought it off of had it custom done to dump? If not and thats how he bought it, then its a DSM style...I have only seen 1 EVO o2 that externally dumped, and it was custom fabricated by FFWD.
http://www.ffwdconnection.com/fleabay.shtml
EDIT: Sorry I just realized that there isnt a picture...but you get that EVO o2s must be custom done, if the kid didnt have it custom done then its a DSM style o2.
http://www.slowboyracing.com/shop.php?sid=&cat=592, you can compare these two, and see which one yours most resembles.

Dustin

 

[Ottoman]

I think the easiest way for you to figure out if its a reg DSM style o2, or an EVO o2 is bolt the o2 up to your turbo, then bolt up your stock DP, if it has no fitment issues it is a DSM style o2, or the DP cant bolt up then its an EVO o2. Also do you know if the kid you bought it off of had it custom done to dump? If not and thats how he bought it, then its a DSM style...I have only seen 1 EVO o2 that externally dumped, and it was custom fabricated by FFWD.
http://www.ffwdconnection.com/fleabay.shtml
EDIT: Sorry I just realized that there isnt a picture...but you get that EVO o2s must be custom done, if the kid didnt have it custom done then its a DSM style o2.
http://www.slowboyracing.com/shop.php?sid=&cat=592, you can compare these two, and see which one yours most resembles.

Dustin

Thanks bro that's a good idea,


I compared to the pic on the site...

at it Appears my O2 bung location is similar to the Evo o2...

The Oem one is near the DP flange... and the Evo's is right in the middle of the exhaust Cavity...

mine seems more like that latter...

I wonder if Emailing RRE would shed some light on the subject...

 

[brute]

The Oem one is near the DP flange... and the Evo's is right in the middle of the exhaust Cavity...

That's where the stock 1g one is.