On my TT Pro 46 I use the towerhobbies muffler, 15% coolpwr, 10/6 apc, and an os #8 plug. I get 15000 rpms on the ground, but,,..,.,.,.,,,.,.,. with that kind of rpm, my engines will not last forever..... I would try the mouse can pipe, but i am sooo lazy, where can I buy one...do they have a mouse can arf?? lol