silenced

My 16V is running and pulling well, but christ it sounds a bit rough. especially if you open the bonnet and rev it from the engine bay. It sounds as if the chain drive, or head or something is loose/worn. Its done 85K to be fair, but i am sure that the 16v should sounds a bit smoother...

guys, justa quickie, my old K03s was silenced but the one i've just bought is unsilenced, the outlet looks a bit shorter because obviously there is no big silencer there, is this going to cause a problem for fitment etc? thanks.

Does anyone know the difference between a KO3s silenced and the unsilenced version , also if there are differences which is best ? Cheers, Jim