Need to do all the bolt on's first. Timing plate, F.A.S.T. HEAD w/domes, V force, and then consider doing the true/weld and porting will be the next step. YFZs are no joke IF setup right. Same for the Banshee but most dont put the time/effort into jetting, gearing, and setup. Porting is where the BIG power comes in on the Banshee.