I fitted the M4 slip-on to my bike. Makes a nice sound, but not annoyingly loud. Planning on putting a K&N filter on as well. So I guess I'll have to get the ECU reflashed again. Almost ready to go for the 2018 season, just an oil change and some chain adjustment left. As far as the slip-on goes, would you guys recommend baffle in or out? Does it make a noticeable difference in performance?
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