If you don't have baffles in your exhaust, you might want to put some in. It quieted my engines noise in the top end down. A portion of the combustion is occurring in the front 2 inches of the primary exhaust pipe and not in the chamber. It is mistaken for a valve train tap, and it's not.
I had some baffles in my old pipes well Just the thundermonster baffles not so much of a baffle more of a washer for some backpressure. Before that PO had stock exhaust fucker was still noisy and road rough as hell. The plugs were fouled and that smoothed out the bike I'm guessing the PO used the enricher frequently.
Either way I cant get baffles in these new pipes unfortunately. And I'm really digging them.
Come to think of it I don't have baffles in my 107 either and that is quiet as can be on the top end.
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