Thanks. I've never had any problems with the simple (small) muffler extensions. If I remember correctly, Clancy back in the day, rigged up something like what Flight Risk has set up. It sure looks like it would keep the Bees cleaner. Usually though, there is some sort of trade-off with something like that (loss of RPM, over heating...). Maybe when it get nice I'm going to have to do some experimenting.