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Discussion Starter · #1 · (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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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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I would try the Nismo headers with hi flow cats...
 

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Discussion Starter · #5 ·
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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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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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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