Yoshimura Z1000 14-16 R-77 Stainless Slip-On Exhaust, w/ Stainless MufflersYoshimura Z1000 14 16 R 77 Stainless Slip On Exhaust, W Stainless Mufflers The popular R 77 offers outstanding performance, thanks to being developed in the heat of competition. It features a trapezoidal design, which allows a large volume of packing material and in turn delivers top performance with minimal sound increase. The R 77 muffler's front cap is MIG welded, while the end cap is riveted using high end 304 L polished stainless steel rivets and