How can I add horsepower, better take off, and a slight growl from flow masters without voiding my warranty?

I have a 2009 GMC Sierra crew cab with the 4.8 liter vortec v8. I only have 11350 miles on it.

Answer #1

im not sure on american cars (if it is an american car) but if its turbo charged add a bigger turbo, induction kit, de-cat it and fit a full stainless steel exhaust.. personally i belive powerflow are the best. note: de-catting cars is illegal in a lot of places.

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