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I am thinking about installing new exhaust on my 82 kz 750 twin csr m1 the current is fine, just want to get the ball rolling on this project. The only exhaust without going custom that I can find is the stock. Any suggestions

Not sure but I think Mac makes at least one, if not two, styles of exhaust systems for a 750 twin. Check denniskirk.com to verify. Why change your old system out if it is in good shape? The stock pipes are probably more quiet than aftermarket... unless you are looking for more noise. Cheers!