Best O2 housing

[triggerx]

Im looking for the best o2 housing for a close to stock set-up.
I have no plans of changing the wastegate or anything, Im looking for direct replacement parts that will yield noticeable gains, even if they are small.

### my current o2 housing is really white inside, guessin it should be replaced.

It would have to bolt to a small 16g and 14b(same size I believe) and the exhaust mani im thinking about ordering is the fp mani because my old one seems worn as well

 

[crimsondragon]

Why does white residue inside the O2 housing mean that it needs to be replaced with the best stock style O2 housing on a 14b/16g setup? You can port the stock one for more flow.

 

[gprix1]

Unless they are cracked or something they don't wear out. You would be wasting money replacing them for that reason. You mention wanting "close to stock" so I assume you would run the stock internal wastegate setup. For this I can think of three options that would meet your goals.
The cheapest would be to just port your stock O2 housing
The next two are around the same cost and they are: SS O2 housing or EVO III O2 housing.
In my opinion the EVO III is the best O2 housing for an internally gated turbo but you will need to port match your turbine housing outlet to match if you want it done right.

 

[JusMX141]

### my current o2 housing is really white inside, guessin it should be replaced.

That just means you're lean. Really lean.

 

[Calan]

In my opinion the EVO III is the best O2 housing for an internally gated turbo but you will need to port match your turbine housing outlet to match if you want it done right.

Ding ding ding... we have a winner.

 

[NHerron]

Someone correct me if wrong which is possible but

If your totally stock exhaust wise, the 02 housing would be last on your list to upgrade for any performance gain. The catalytic converter would be of first conern

 

[Calan]

If your totally stock exhaust wise, the 02 housing would be last on your list to upgrade for any performance gain. The catalytic converter would be of first conern

True story. And even after a full O2-back exhaust upgrade, I'd still only switch to an E3 or FP manifold, port the stock O2 housing for $0, and then maybe upgrade to an E3 O2 housing (assuming you are changing the downpipe to match the flange angle).

In fact, that is exactly the route I took several years ago.

 

[gprix1]

^^^^^ Agreed except for the manifold part. I like my turbos to spool as fast as possible. 20g and smaller turbos will not gain enough on top end to justify the loss in velocity from a larger manifold.

 

[T is for TURBO]

20g and smaller turbos will not gain enough on top end to justify the loss in velocity from a larger manifold.

EVOIII manifold was originally bolted to a 16g? I don't think upgrading to an E3 or FP manifold would cause a slower spool. At least a noticably slower spool? I have been known to be wrong in the past though.

OP- I vote to fix your lean condition, then port your existing O2 housing.

 

[Calan]

I don't think upgrading to an E3 or FP manifold would cause a slower spool. At least a noticably slower spool?

I went from a stock 2g manifold, ported O2 housing, and an E316g, to porting the mani... and then to an E3 mani and ported E3 O2 housing. Eventually I switched to the FP race mani.

I never noticed any appreciable change in spool, although this was a 16g setup on a stroker...so it was pretty insane anyway. I'd have to dig through some old logs, but IIRC, I only saw incremental increases in top-end airflow as I started opening things up around the turbo.

 

[T is for TURBO]

I went from a stock 2g manifold, ported O2 housing, and an E316g, to porting the mani... and then to an E3 mani and ported E3 O2 housing. Eventually I switched to the FP race mani.

I never noticed any appreciable change in spool, although this was a 16g setup on a stroker...so it was pretty insane anyway. I'd have to dig through some old logs, but IIRC, I only saw incremental increases in top-end airflow as I started opening things up around the turbo.

I've got an FP Green (> 20G, I know, but it's close) and an FP manifold waiting to be bolted to my car as soon as my awd swap is finished. Maybe I'll test out the green with the stock manifold first, than swap it out for the FP manifold and see what the difference is (2.0L @ 8.3:1CR)

We are getting off topic

 

[NHerron]

Well this counts as back on topic since its an alternate 02 housing, I liked the E3 housing for durability and stock flow size but what about the Megan Racing 02 housing? It's 2.5" all the way through with a nice WG passage and is direct bolt on. Since it doesn't hold a lot of weight cracking wouldn't be an issue either. The only con I see is the heat it would give off especially near the alternator so wrapping would be an interest or a heat shield... I'm installing mine this week... going from stock 2g housing

 

[007jimmy]

I run the E3 o2 housing. Its massive in size, stock appearing and my 2g lower heat shield fit right over it with no modifications. No more cooked alternators.

 

[T is for TURBO]

You really can't beat the price of an Megan unit and so far, from my expirence, they make a quality product. But you are right, heat is alway going to be a factor when going with a tubular style manifold/O2 housing.

I was going to go with one myself, but I couldn't justify the purchase, since I havem something like, four 2g o2 housings laying around. I just need to be less lazy and port one of them.

 

[LxiMax]

It sounds like the best way to go is e3 manifold, e3 o2 housing, and e3 16g.

 

[Doubleot]

I went with a megan racing o2 housing. Honestly I couldn't comment on the power gain because I just don't remember (I threw it on over a year ago) but its very well built and has never cooked my alternator (Knocks on wood) I was going to use an E3 housing before I found this one for a great deal. Bolted up with no issues what so ever.

 

[NHerron]

Wow really no damaged alts?

I have the oil filter housing which is water cooled so the oil filter points toward the passenger side. I've wondered if doing hot oil changes would be a hazard now since tubular would surely burn the hell outcha

Anyway I just didn't get the E3 housing because I would have to modify the downpipe. I don't have a welder and even then I would probably add a pound of piled up metal from my shit welding skills... weld would burn through the thin pipe etc

 

[Calan]

It sounds like the best way to go is FP race manifold, e3 o2 housing, and e3 16g.

Fixed. The E3 mani would be a close second.

For a fun, fast, and reliable small street setup, it doesn't get much better than that.

 

[triggerx]

Well heres the thing, so far I have a 3 inch exhaust, 3 inch cat, and a megan racing 3" downpipe actually.
I figured that the O2 housing i currently have is doing nothing but restricting gas flow.
had the number 6172 if that says anything to anyone

 

[Calan]

Well heres the thing, so far I have a 3 inch exhaust, 3 inch cat, and a megan racing 3" downpipe actually.
I figured that the O2 housing i currently have is doing nothing but restricting gas flow.
had the number 6172 if that says anything to anyone

Just port the outlet of it to smoothly blend into the downpipe as much as possible, port the wastegate opening to help a little with any boost creep issues, and enjoy it.

And find out why you are (or were) running lean enough to bake the O2 housing.... before you melt something.