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I'm not sure that any cat back will give you gains. Try a search, but everything I've seen shows that the header and cat are the most restrictive parts of the car. You'd be better to get an aftermarket stainless steel though b/c they are only $200-300 more than replacing the stock one.
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CG/Ebony/Non-Navi/6MT
TSX Key Mod
Comptech:
Short-Shifter, Exhaust, Header, Springs, RSB
RT Cat
Hood & Trunk Shocks
KPTech Window Up, VSA off, 1-Touch Sunroof
Hondata Gasket, Reflash
My Cardomain
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