A lot of noise with a muffler and NO power gains noticible
not if you count 1.5-3 hp to the wheels a noticible gain
so if you want the real thing, i'd go with the Apex N1 cat backs or like me, get the 5Zigen fireball
a got like 15 to the wheels with the 5Zigen and i heard the N1 gets a little more
great throaty sound too, no rice farts with a catback
you can't go wrong :thumbup: