i'm getting all three. i've never used bmc before , but have used k&n for years. no loss of filtering with them. not sure about bmc. these new bikes are very lean down low( i'd guess to pass epa) and very rich on top. i guess they figure thats where we'll be riding most. that explains what i thought was a lean surge just off idle. also notice it at 3800 to 4000 when riding with my grandson and son. slow is the rule.
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