I've been on the fence about that and I want to know your opinions on dual pipes on a 4 banger?
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if you do duals. do a single in/dual out muffler. with tail pipes no bigger than 2''
A 4-banger, or a V6 for that matter, doesn't flow enough air that duals will help. Too much pipe will slow down the exhaust velocity and actually hurt power. Just keep a single system and use a turbo muffler. It will be fine and not sound like shit.