has anyone altered their tanabe cat back. i have heard they are more restrictive but reading their website they say its a straight thru muffler. i was wondering if anyone had taken out the resonator that came with it and if it changed the sound. dont get me wrong i love they way mine sounds but im just cruious if there would be a hp change or a change in sound. i am going to take the axle back off soon and see how that sounds.