I was wondering if I could get some help with the following. I've had my 05 600RR Tribal since last August (I had another one but it got jacked), and have just now started to tinker with it. I've got after-market turn signals, fender eliminator, frame sliders, and Dunlop qualifiers. But I'm looking to get an exhaust along with a PC3, but i'm stuck deciding between, Arata, Akrapovic, Two Brothers and Yoshimura I like the new box-style that they have, but want to know which is the better sounding, any help would be appreciated. Whats the best recommendation for regearing with a 520 conversion.