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dual exhaust is a bad idea on a civic unless you have 2 seperate systems. if you only have 1 system with 2 mufflers you only add weight and create back pressure ( like everyone else said ) if you are looking for a quick jump in horsepower with out adding a supercharger you need to dump the dual exhaust idea and get you a header, make sure you get a 4:2:1, because the 4:2:2 cause turbulance on civics which is going to actually cause you to lose torque.
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