Do I need to add the intake and flash the ecu just to put slip on mufflers for my 2008 UC. If I am only going for a better sound why do everything else. The mass air flow sensor is still contected and I am not changing anything before it. The bike still has the same air to fuel ratio as before but the exhaust is different. I know it would give me better performance with the whole stage 1 kit but for what I want right now is this ok?