The MotoGP-inspired R1 has been through quite a transformation since its introduction. It now features a crossplane crankshaft with a unique firing order that makes a big bang! Yamaha engineers set out to make the R1 produce smooth power and tons of torque while putting it all in a visually stunning package. They definitely hit the mark. Yoshimuraâ€™s undertail slip-ons are the perfect setup for this hot-looking bike. The undertail R1 twin TRC-Dâ€™s are works of art, and weâ€™d readily argue that the Yoshimura TRC-Dâ€™s are by far the best looking R1 pipes on the market. The undertail R77 Â¾ system, which includes Y-pipe, makes this great bike even better with its perfect fit and awesome performance.