Hi Big Daddy,

The Asp 108 runs fine with no problems, plently of power for this spit, althou a four stroke would sound more the part but has great performace to fly scale or do all the stunts....

Yes some of the cowl has to be cut away for the standard muffler but no different to most cowls. I would say about 3 cm sticks out visible, so not much at all. If i was to do it again i would probably go for a pitts style muffler for this, but the standard one will work ok just a bit more cutting is needed.

Hope thats of some help