ok so my Friend bought a 400ex and it needed an exhaust clamp which he never got causing the pipe (the part where the muffle connects to the pipe of the head) to shred kinda not really Shure how to explain it but i know i can fix it and make it fit so that's not a big deal anyways i need to know if i put this on my z400 and get the jets right will it mess up my motor? my motor is about to have a new hot rods crank installed a new jug a new piston, rings and timing chain put in so if i have my mechanic install the pipe and jet it right can it mess up my motor?