exhaust header manifold for T3 ?

Gentelman,

has anyone ever had any experience with ported and polished exhaust manifold or using turbo headers for T3? Performance gains if it would be noticable?
There are 4 anti-swaybar bushing on Spirit R/T, those 2 on each end of anti-swaybar .... where could I buy a polyurethane bushing to replace worn out stock soft rubber bushing ?

Thanks

[mopar2ya]

I did some gasket matching and minor cleanup on the T3 manifold, but cant attest to any gains other than my car runs 12.70s.

I will soon be working on a header for the T3 cars, but you can always extrude hone your manifold. The back pressure is really bad as in a 3:1 ratio.

wallace

[gdonovan]

Quote:

Originally posted by mopar2ya I will soon be working on a header for the T3 cars, but you can always extrude hone your manifold. The back pressure is really bad as in a 3:1 ratio. wallace

The problem is the turbo, not the manifold.

[mopar2ya]

Gary,

I am sure it is part of it, but with the larger turbo exhaust housing, I would think a freeer flowing manifold would be beneficial.

This winter I'll be able to do some verifying of this, I am starting my 9.?? Omni project. Thats the goal for next year, we want to do it on a budget with fairly obtainable parts. Like the extra Holset turbo from a Cummins pickup, a diesel intercooler etc....

For now I will have to settle with getting the Spirit to the 11s, I need to knock my 60 ft by 1/10 to a 1.8 and add 4 psi of boost and a nice cool evening and I'm there.

By the way how stable was Relentless at 130+ mph?

[gdonovan]

Quote:

Originally posted by mopar2ya I am sure it is part of it, but with the larger turbo exhaust housing, I would think a freeer flowing manifold would be beneficial.

The R/T piece is much better then the SOHC unit which has been proven to support over 400 hp. A tuned header is always nice but you are looking at gains of less then 4%

Quote:

By the way how stable was Relentless at 130+ mph? [/b]

Very stable, even at 150.

[4sfed4]

Quote:

Originally posted by gdonovan The problem is the turbo, not the manifold.

Yes....I plan to get backpressure readings with the 0.63/Stage 3 turbine side shortly (if it ever stops raining down here....).

[4sfed4]

Quote:

Originally posted by mopar2ya The back pressure is really bad as in a 3:1 ratio.

13 psi boost on the stock turbo with a 3" exhaust showed 43 psi exhaust backpressure on my car. Terrible!

Wallace,

when you have time to take a picture of your home made turbo header for R/T, please send me a few images of your working prototype. I like the idea of extrude hone , but never have $ 300.oo plus in my wallet for the extrude hone job! Have you taken out the turbo exhaust manifold and ported & polished the stock manifold? Are you interest in doing another one? I tried to loosen 10 mm bolt on manifold, the only thing I twised was the stud. How could I get the 10 mm bolts to turn loose without breaking any more stud? Is there an easy and afforable way to ask mechanic to remove the broken stud and have manifold out of the car?

Gary & Wallace,

Do you have an over size down pipe on your cars, is there any company selling larger downpipefor R/T ?

Thanks