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Originally Posted by fiberglasscivic
yeah but if you go too big you loose horse power because now, instead of using the movement of the pistons to push the exaust out of the engine you're almost sucking out. It can cause problems, I've seen lots of my friends with civics (usually boosted) do 3 1/2" exhaust and loose hp. I think that Whathits14 was right about the car needing to be a beast. You should be pushing a lot of hp before your go much bigger than 3"
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He is selling it for a TURBO dsm. None of that bullshit applies to turbo cars. Bigger is better.
IMO if you need more than a 3'', it's time to run an open downpipe at the track. Buschur sells a 3.5 which very few cars can justify... but 4'' is just silly.