Check the Renegade exhaust site -- they do dual exit systems to each side. Was considering them for a while until I realized it would make the ZX-6R look like less of a sportbike and more of a tourer.
A forum community dedicated to all Kawasaki motorcycles including the ZX-6R, KLR 650, Ninja 250, Ninja 250R, and Vulcan. Come join the discussion about performance, modifications, troubleshooting, maintenance, and more!