The best bolt on I can think of are obviously a new intake and exhaust. I have a 4.8, and have a flowmaster 40 series exhaust, but I didn't have to remove the spare tire for it. I also have a K&N FIPK which is awesome. I'm also looking into a Nelson tune, seems to be one of the best out there. I also have a question on headers. Does anyone have some shorty headers? Do they make a noticeable difference. I've heard shorties can be one of the worst investments. What's your
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2004 Chevy Silverado, 2002 Chevy Camaro Z28
4.8L V8, 5.7L V8 6-speed
Truck-Flowmaster 40 series 3.5" Tips, Car-Magnaflow, Volant CAI
K&N FIPK 77 series
