Depends how keen you are on a cat back though. For the Civic fds i read a bit on other forums, that the catback doesnt give that much gain. It gives more gain at top end. I mean if your building for car for track. it would be useful, but all in all i prefer the axle backs. For eg, the J's racing axle back. sounds nice, looks nice and its lighter then the stock. But thats just my opinion.
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