The Raptor is a single cylinder bike and there are 4 or 5 duals for them and there is little to gain if you only plan on doing the big 3. However if you go into the engine (porting, cam, etc) There is a lot to gain. If you go into modding the engine and use a single the engine will fall flat on its face up top, with a single you will keep revving and pulling. Besides the TRX with duals would look absolutely sick!