I have a 01 426 Supermoto with a full titanium Yoshimura pipe. For supermoto racing I have the pipe wide open and the bike runs great. For an upcoming race there is a 96dBA limit for the class I want to run in. I tried the two quiet inserts that I have for the pipe and the bike ran really badly. With the most restrictive insert I could only turn the throttle about 1/4 turn then the bike would miss, it was slightly better with the less restrictive insert but still ran badly - unrideable let alone raceable. Any ideas for how I can fix this? This method of making the bike quieter by making the exhaust opening smaller seems to rob a ton of power. There is nothing that can be done with exhaust packing? Does the stock muffler fit the Yoshi head pipe (doubtful). I don't want to do any thing too radical to the bike as this is a "one off" race and the bike runs great with the current set up.