Well I bought the WRH racing pipe, gonna leave on the battery, but i think I'm gonna remove oil injection, Bill at WRH gave me a sweet package deal which includes Pipe, Variator weights, clutch spings, titanium reed cage, aluminum head and cdi box, I would recommend WRH to anyone looking for performance, because of the info and service. gonna spend Thanksgiving day putting it all on , I will let everyone know how it performs.....