As far as upgrading v-6 exhaust you can put new headers, new h-pipe, x-pipe, mufflers, and tail pipes. Most people put a h-pipe on and than two flowmasters, borla, or dynomax. Cat back means that it start after the catalytic converters (cats). If you get an Off-road h-pipe it does not have cats, therefore it flows better. Cats, turn Carbon Monoxide into Sulfuric acid so that it is less polluted. I have the off road h-pipe so mine is louder and get more HP.
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2003 Sonic Blue Cobra
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