Yoshimura CBR500R 16-25 R-77 Stainless Slip-On Exhaust, w/ Stainless MufflerYoshimura CBR500R 16 25 R 77 Stainless Slip On Exhaust, w Stainless Muffler The Honda CBR500R sport model and engine combo is a perfect blend of style, ridability and power. Always on the lookout to make things better, we felt that the 471cc DOHC twin cylinder engine could use a little more fun factor. We enlisted the R 77 slip on in Works Finish to gain max performance on the CBR. With some nice gains in horsepower and torque, the R 77 got the job