I installed my TBR slip-on yesterday and the sound is awesome. Not too loud at idle and when the rpm's rise the pipe has a nice rumble. I am happy. [:M6] If anyone is interested in buying a slip-on exhaust I recommend a Two Brothers Racing for your 636. Installation was done under 30 minutes, very easy to follow and bikes feels awesome. Handles good and I felt a slight difference in performance, bike feels like it has more torque and it's more responsive than before. Well mred, now I know how you felt when you installed yours and yeah I didn't forget about the graphite gasket from the stock pipe, I took it out and installed it along with the new one. Thanks dude.