2018 Kawasaki Z900RS First Ride Review + Video

The RS marks the first time Kawasaki has used sound research to craft the a bike’s exhaust note, focusing on the initial roar to life, idling, and low-speed riding, where the deep growl is easiest to hear. Pipe length, bends, collector design and the density of the glass wool fibers in the silencer were all examined before hitting on the right combo, Kawasaki says. At low rpm, the exhaust escapes in a straight line; at higher revs the exhaust gets routed through an additional passage.