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you need the 3" exhaust to keep up! In all honesty it will make your turbo spool a little sooner. Thats about it. I only have the downpipe + cat. Really dont notice much if any difference in noise. But the full 3" isnt going to be that loud. Get a K&N filter too. Oh and dont speed on 93 like me.
posted by 66.82.9...
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