V-Mods are modified stock slip-on mufflers by Steve Rauch of V-Mod.com. He removes the inner baffle and leaves the outer baffle in place. The Turbo Tec 2 into 1 is probably the best PURE performance exhaust available. It has some shortcomings however. No heat shield and it's low.
How about the D&D full system. Read it should perform best when properly tuned (TurboTechs may provide more power). Liked it best from the sound files at V-Mod.com and really did not like how Supertrapp sounded. Anyway I am really looking for performance and will buy Supertrapp if necessary for power reasons but seems like they will touch the ground easily on every right hand turn when ridden hard (all the time). Really seeking feedback on the D&D full system.