first off i got a 2007 grand prix base Naturally Aspirated 3800 series III. second how much Horsepower can i gain from a Borla Stainless Steel Cat-Back Exhaust System, by itself when my car is stock. that vs how much Horsepower can i gain if instead i add a Jetchip Module, Ported exhaust manifolds, a HV3 High velocity intake insert(from zzPerformance.com), and a downpipe. how much can i get from this one. And no intake because i have been told i only get 0-5hp max. that cost the same as the manifolds and i get more from them. and ill spend about $1200 maybe less so no turbocharger its like 3k. but i want to gain at least 30hp and which one can do it. and is that a good combination of those parts i stated. plz need help and need approx gain of each part too plz.
http://www.intense-racing.com/Merchant2/merchant.mvc?Screen=CTGY&Store_Code=IR&Category_Code=3800_PP
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