I'm sure there have been plenty of thread on this, BUT... My 7 year old son is saving his pennies for an exhaust. He really wants an FMF, but it will be quite a while before he can save up that much money (~$180). Also, we wanna keep it kinda quiet. Don't wanna piss off the neighbors to bad. Is there another exhaust out there that is just as good for the less money? Any FMF owners out there not happy with it?