ok i have the paul turner high rev witha custom riged ish silencer until welding 2 starts and i can make stuff again, but any who i have the high rev pipe and absoulutly love it, the down low is pretty good but when your like half way through the rpm it pulls the front up a wee bit or spins the tires and also it revs out higher than other pipes i rode trails and fields with it and the city streets (shhh) and i love it its absoulutly awsome and y hardly ne 1 else has them idk, if u have 1 tell me if u like it 2 or had 1 i guess