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Pipe fitting problems.

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I did not search dont know what exactly what to write. But I just got an 03 crf450 and bought an fmf powerbomp header also got a Biggun Exhaust.(Ebay very cheap) They line up but the exhaust is a little smaller about 1/8 at most 1/4 inch. Should I try to expand the exhaust with a pipe tool or use heat wrap and a clamp or try to find a spacer. Anyone with a good idea. It works fine with stock pipe but I really want to use the powerbomb header.

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