One thing that I have noticed on my bike ( 2014 Factory Replica EC 300 ) is that the inner ring of the stock pipe contacts the end of the exhaust spigot resulting in a very annoying rattle. I have temporarily eliminated the noise with a home made gasket, new rubber o rings and lots of Silicone. The gasket burned out rather quickly and the rattle returned. I am planning on trying a copper exhaust ring spacer from an early CR 250 to see if it will provide a permanent fix. I have also considered machining either the spigot or the ring inside the stock pipe down to provide a little clearance.
I was previously using a House of Horsepower cone pipe that didn't have the welded in ring and there was no rattle at all. Unfortunately the mounting bracket that is close to the kick starter broke off and I haven't had time to get it repaired yet.
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