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I used a 3x3 coupling and it was real loose too, but i just tightened the clamp down on the coupling super tight. If that doesnt work then you could probably try a 3x2 but it might be too small.
on the 97s the air box inlet is smaller so just use a 3x3 and clamp it down tight as you can get it, it will look a lil funny but it works. ive done 2 97s after i did mine
think it will help if you cut little v's out of the end of the pipe where it goes into the sidewall? i know it wouldnt allow for much more air flow but would seem like it would allow for a small amount more..
kk wasnt sure how it all fit in there.. doing it tommorrow, my dremel died and i dont have any files so im waiting on the battery to charge.. is a 6" pipe to long?