How much horsepower will an exhaust add
235

Asked by Widman350 Jul 20, 2012 at 03:39 AM about the 2000 Pontiac Grand Prix GT

Question type: Car Customization

I have a 2000 grand prix with the 3.8 in it, ive added a magnaflow cat and then dual SLP flowthrough mufflers, plus high output coil spark plugs and msd wires. About how much hp do you think ive added from the original 205hp

Also i have a 91 k1500 silverado that has an aftermarket throttle body, cold air intake, perfomance headers and cat, and glass pack muffler, also msd wired and high output coil. stock was 210hp.

2 Answers
17,065

Chase answered 12 years ago

no tuning done on either? both probably gained anywhere from 5-10 hp.

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