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2G O2 housing for E3 TDO5H in a 2G

Justin DuBois

Proven Member
838
638
Aug 15, 2019
Oakland, California
My B16G turbine housing cracked and died (D2 casting)

I have located a E3 style replacement, but noticed the internal chambers do not line up perfectly to my ported 2G O2 housing. If you compare the 2G SS gasket to a E3 SS gasket you will notice what I'm talking about.

My question today:
What O2 housing makes a good transition from an E3 turbine housing to a 2G down-pipe flange?

I'd like to avoid reworking my downpipe, and I'd like to keep a cast housing that uses the stock O2 manifold heat shields.

Suggestions?
 

JusMX141

Moderator
15,088
1,133
Dec 13, 2005
Greensburg, Pennsylvania
Evo III o2 housing and deal with the potential fitment issues, or something custom-fabricated. You can also port your existing o2 housing but you'll never get it to a full 60mm throughout the entire piece like an Evo III o2 housing.
 

High PSI

15+ Year Contributor
137
14
Oct 21, 2004
USA, Australia
Correct me if I'm wrong, but didn't someone (RRE?) used to make a downpipe that worked with the Evo III housing? Are there no longer any options?
 

agentorange313

Supporting VIP
2,017
97
Dec 21, 2008
Westfield, New_Jersey
Correct me if I'm wrong, but didn't someone (RRE?) used to make a downpipe that worked with the Evo III housing? Are there no longer any options?
Yes they did, many moons ago LOL. Downpipes are no longer available from them. They did make some really nice quality ones too.
 

High PSI

15+ Year Contributor
137
14
Oct 21, 2004
USA, Australia
Yes they did, many moons ago LOL. Downpipes are no longer available from them. They did make some really nice quality ones too.
Yeah, I've had this car nearly 20-years and it's mostly sat for the last decade, but now that I'm now getting back into it, I'm finding A LOT of stuff is no longer available.

Good downpipes is one of them. The non-SS flex pipe on my existing downpipe is on its way out, and since my downpipe was previously hacked-up for a cat-install to pass emissions I'm thinking it would be better to just purchase a new unit as opposed to repairing my old one.

Is there a "go-to" downpipe these days? I see a lot of mention of Megan Racing but I can't even find where that one is sold. It also looks like its got an odd transition/reduction right up near the O2 housing.

This one looks on the PR website looks perfect (2.75" at the O2, opening to 3" almost immediately after):


...but it links to a dead amazon.com link and I can't find it anywhere for the life of me. I would probably be upgrading to an Evo3 O2 housing at the same time, so would be having the flange cut and re-welded on at the proper angle.
 

Xarzor

Supporting Member
94
52
Jul 21, 2020
Denver, Colorado
Yeah, I've had this car nearly 20-years and it's mostly sat for the last decade, but now that I'm now getting back into it, I'm finding A LOT of stuff is no longer available.

Good downpipes is one of them. The non-SS flex pipe on my existing downpipe is on its way out, and since my downpipe was previously hacked-up for a cat-install to pass emissions I'm thinking it would be better to just purchase a new unit as opposed to repairing my old one.

Is there a "go-to" downpipe these days? I see a lot of mention of Megan Racing but I can't even find where that one is sold. It also looks like its got an odd transition/reduction right up near the O2 housing.

This one looks on the PR website looks perfect (2.75" at the O2, opening to 3" almost immediately after):


...but it links to a dead amazon.com link and I can't find it anywhere for the life of me. I would probably be upgrading to an Evo3 O2 housing at the same time, so would be having the flange cut and re-welded on at the proper angle.
It was hard getting a down pipe in 2019 when I bought my dsm, especially for a fwd. Are you looking for a 2 wheel or 4 wheel drive down pipe? I have a donor car that has a 2 wheel drive aftermarket down pipe on it.
 

High PSI

15+ Year Contributor
137
14
Oct 21, 2004
USA, Australia
It was hard getting a down pipe in 2019 when I bought my dsm, especially for a fwd. Are you looking for a 2 wheel or 4 wheel drive down pipe? I have a donor car that has a 2 wheel drive aftermarket down pipe on it.
AWD
 

randman2011

10+ Year Contributor
517
239
Feb 26, 2012
Indianapolis, Indiana
@High PSI I feel your pain. I am running the Evo 3 O2 housing and the RRE downpipe is exactly what I needed, but the only option these days seems to be custom. I was planning to scrap my Megan unit but I guess I'll keep using it for now. STM is holding the fort down with good current exhaust options and I should have bought their downpipe when I ordered my catback, but c'est la vie.

 

High PSI

15+ Year Contributor
137
14
Oct 21, 2004
USA, Australia
@High PSI I feel your pain. I am running the Evo 3 O2 housing and the RRE downpipe is exactly what I needed, but the only option these days seems to be custom. I was planning to scrap my Megan unit but I guess I'll keep using it for now. STM is holding the fort down with good current exhaust options and I should have bought their downpipe when I ordered my catback, but c'est la vie.

Thanks Randman - I really appreciate the info. However I've had a horrible experience with STM so they've permanently lost my business. I'll need to look elsewhere.
 
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