So far I have been on the road with a Remus final pot and pre-muffler replacement pipe. Since I still somehow lacked the sound, I opened the Remus final pot today, threw out all the insulation material and welded the pot again. Result: more core and louder. But now comes: between approx. 2500 and 4000 rpm a perverse squeezing whistle noise arises when speeding up. However, only at speeding up and only between 2500 and 4000 rpm. I take gas away ode r keeps the speed constant, the whistle is gone immediately. What is that? The sound definitely comes from the exhaust. Could it somehow be related to the loader or is the empty end pot the cause?