They, RCC and Velocity are close to the same money for th stage 1 setup. I have a Velocity was not Happy with some things, did install myself and took there word that getting it dyno mapped was not nessesary, the map they send with the kit is fine, it was not. I melted pistons in about a month. the map and fuel pres settings they recamended were way to lean. I leaned this when I repaired the engine and purchased a wideband and data recorder as soon as boost hit it when past 18 to 1 on A/F. when this was relayed to the people at Velocity they acted like it was no big deal. so because of this I rec RCC. if you can do the install your self great, but get to a dyno and have a custom map done for your bike, as I have learned the hard way the tune up it THE most important thing to do, for a trouble free setup.