Anybody running S/C, headers + high-flow cats?

809 Views 6 Replies 5 Participants Last post by QShip, Nov 24, 2007

chargedTitan

Discussion Starter · Nov 22, 2007 (Edited)

I'm thinking of putting headers back on once I get my S/C issues resolved. Stillen long tubes came off because of leaks, but before the leaks started I had a huge loss of torque and H.P. with the headers. I'm wondering if my Borla dual cat back was the cause of the loss of torque and H.P. My question is should I put the repaired set of Stillen long tubes back on and try to run with high flow cat's to maybe increase the back pressure some. The borla muffler is a 2 in 2 out design with 2" piping out the back. Maybe I just need a new muffler, 2 in, single out with 3" piping out the back. Any ideas?
Happy Thanksgiving:cheers:

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Warp09

· #2 · Nov 22, 2007

For optimal gains for an exhaust, you would want a 2.25" piping size all throught for DUALs. For a single side exit, you want a 2.25" Y pipe to a 3" single exit piping...

HF CATs should be fine with your S/C. WHen I throw mine on, I plan on running the JBA set up with HF cats and JBA Headers..

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kuntao

· #3 · Nov 24, 2007

I would put the long tubes on with the s\c..just my opinion..I would be afraid of blowing a cat while running boost...

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QShip

· #4 · Nov 24, 2007

I would try the Nismo headers with hi flow cats...

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chargedTitan

Discussion Starter · #5 · Nov 24, 2007

Kuntao and Qship- Did you guys experience performance gains with the longtubes? I expected some loss of torque at the low end, and more H.P.at the top. But what I got was a huge loss of torque and horsepower throughout the powerband. I wonder if my cat back system is to blame. With the stock manifolds and cats, it's a freakin' rocket.

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sc186

· #6 · Nov 24, 2007

The addition of headers to a supercharged vehicle will often cause a LOSS of boost. You can get back what you lost by pullying down, changing to a cam with less overlap or use more restrictive manifolds. Also, make sure you are using the highest flowing intake possible and that you tune for the headers. You could be running super rich if you truck is tuned for more boost than it is getting.

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QShip

· #7 · Nov 24, 2007

chargedTitan said:
Kuntao and Qship- Did you guys experience performance gains with the longtubes? I expected some loss of torque at the low end, and more H.P.at the top. But what I got was a huge loss of torque and horsepower throughout the powerband. I wonder if my cat back system is to blame. With the stock manifolds and cats, it's a freakin' rocket.

I'll have to let you know. I made 391 hp and 410tq with stock headers and cats. A/F ratio was 12.5. I am running dangerously lean now, so I will have to get that straighten out before I can answer your question.

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