I just bought a 2004 KFX 700 from the original owner. He put a set of DMC Alien Dual exhaust pipes on it but did not re-jet the carburetors. The altitude here in Oklahoma is around 1500' if that makes a difference. The bike really runs great but I've been told the carbs should be re-jetted with the better exhaust. Does anyone know if I really should re-jet the carbs and if so how much? Any advise would be greatly appreciated.