09-14 YAMAHA YZF-R1: Yoshimura TRC-D Slip-On Exhaust (Street/Carbon Fiber) The TRC-D is the latest in Yoshimura's line up. This slip-on muffler resembles the popular TRC muffler, but with one very special feature: while the TRC-D features the same Tri-Oval shaped sleeve, Yoshimura took it a step further and created a Dual-Taper, Dual-Tip Carbon Endcap. The Dual-Taper exhaust manages sound better in both high flow and high power applications. The resultant sound output is music to the ears and lower lap times on the track! Tri-Oval-shaped stainless steel sleeve to maximize muffler volume while retaining superior ground clearance and a unique exhaust note. Offers a sleek silhouette to flow with the lines of the motorcycle.