New to the forum. I'e been away from dirt bikes for years. Fuel injection is new to me. I searched but really didn' find anything on my question. I just bought a new 450 that came with a yosh stainless slip on. Do I need to changed the head pipe or is the head pipe good enough? I know technology has come a Long way. And should I just use stock green coupler? These things have become technical from when I stopped riding. Thanks in advance.