Meanwhile, 30 years of evolution gave production sportbikes greater performance and durability than the pure racers of just a few years earlier. This made much of Superbike racing’s R&D unnecessary, while the marketplace naturally equalized performance among all makes. This made it both possible and desirable to formally limit R&D, opening the field to more factories and private teams. The result has been closer and more varied competition.The Team Cycle World Attack Performance Yoshimura Suzuki AMA Pro American SuperBike is getting a turn-key lease engine from Yoshimura Racing. After completion, our engine will drop into a chassis donated by American Suzuki, with assembly and race setup by Attack Performance.