Philippe1985
Junior Member
I know that an aftermarket exhaust system needs new damping material from time to time. But for a stock exhaust, which hasn't got that, does it downgrade too? And in what way? Because my bike has now 20000km and it is really louder and deeper at iddle. There are no gas leaks. Or could it be the katalysator that becomes older? It started just before my last service. The bike has had all service in a Yamaha dealer. Thanks for reactions.