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Does anybody know if the retro chambered and atak are louder than the npp? Thinking about getting one of the two. I'm running kooks long tubes now with cat delete pipes and npp. It's loud now but I've already got used to it and want louder.
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2014 2SS/RS M6-ZL1 SHORT THROW-Z28 INTAKE-KOOKS 1 7/8 CATLESS HEADERS-NPP EXHAUST-TUNED BY STEVE AT RDP ON 100 OCTANE-446 WHP-412 WTQ
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