Quote:
Originally Posted by Don@Accelerated
So this is a modified OEM Header and 2.5" Race Exhaust System. I ran it back w/ the street catback and it netted a loss of about 10hp and ftlbs.
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Let me see if I understood. You are still @20 psi, but added those parts you just mentioned which resulted in the increase from 439 whp to 461?
Also, what combination resulted in a loss of about 10HP?