Recently got the Arrow 71731AON's installed on my bike (Monster 1100), sans db-killers.
DSC_3994 Prior to this I've never had any experience with after market exhausts on bikes.
And it has transformed the bike from a docile kitty to a make the beast angry tiger.
All other road users anxiously steer their vehicle to the side at the blimp of the throttle.

Maybe I'm exaggerating a little but it does add some volume to the exhaust note.