I've been researching aftermarket exhausts (full and slip-ons) and there's not much out there. Now, I know I've been spoiled by the plethora of choices available to the SV, but come on! I think only Two Brothers and Renegade offer slip-ons right now. IMO, there's nothing that sounds better than a piped V-twin. And also, the performance gains from the Two-Brothers slip-ons are minimal, at best. So, I'd think a full exhaust and a remap would gain alot more HP from the motor.