Page 124 of Kawasaki Motorcycles by Kawasaki USA

All-aluminum, closed-deck cylinder block with plated cylinders is light, long-wearing and offers excellent heat dispersion. Stainless steel quad mufflers are polished then heat-treated to an attractive golden colour. Exhaust patina will age to an aggressive street fighter look. KLEEN (Kawasaki Low Exhaust Emission) uses two honeycomb catalysers located ahead of the quad mufflers (one per side) to keep emissions low. Unitized front footrest, rear footrest, and muffler bracket creates an open, airy look to the tail end.

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