Improving peak power and torque the new Yoshimura USA R55 and R77 slip-ons add performance and style to the BMW S1000RR BMW S1000RR Slip-On Exhausts Yoshimura has always proved its products at the highest level where it matters – the racetrack. Every scrap of knowledge acquired at circuits the world over makes its way back to Yoshimura’s R&D engineers and every part made – for road or competition use – benefits from years of experience; producing the ultimate outright performance and unsurpassed quality.