I have a left muffler for sale. I purchased it on E-bay and it is in an excellent condition. However the muffler
I wanted to replace turns out to be a limited edition for circuit use. I didn't even know those things excist because it looks exactly the same as the standard silentiums. Found it out after a hard search on the net.
However this standard muffler is for sale now for 75 euros excl. shipping. I've also hat a look at http://www.stein-dinse.de and they are selling the new replacement mufflers for 450 euro a piece. So this must be a bargain.