PB strapped an '03 R1 to a dyno and compared Arrow ti, Akra hex carbon fiber, Yosh stainless Tri-Oval, Micron Delta Plus ti, and Arata carbon fiber slip-ons with PC and remap. Yosh picked up 4.7HP and 1.5 lb. ft. Arata gained 4.3HP and 1.6 lb. ft. Akra got 4HP as did the Micron. Arrow picked up 2.5HP. Yosh was loudest- these were all run with the db killers removed- and had the "Best Sound." Akra was the lightest, Arata had the best build quality, and Micron (out of business?) was the cheapest. Comments?