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Swap headers for something with scavenging and higher flow than stock, use high flow (CARB approved) cats, 60mm piping, and run it into a truly blended y-pipe (not the chevy "under the tranny pan" BS). You might see a gain of 1%, but it will sound A CRAPTONNE better, and you'll have more power when you want to use it.
This is of course provided you're running a stock engine with next to no current modifications, and it's either a V6 or V8 with a naturally crappy OEM exhaust.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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