Arrow 71912XKI X-Kone Nichrom Slip-On Muffler w/Carbon End Cap for Kawasaki Z900 20-24Arrow X Kone Slip On Exhaust Suzuki Kawasaki Z900 The Arrow X Kone was originally developed for racing use on the Arrow Competition Exhaust System, now that same race track pedigree is available as a slip on exhaust. The tapper shape of the Arrow X Kone was developed in conjunction with the WSBK Alstare Suzuki Team to be compact, aerodynamic and to perform under race conditions. The muffler sleeve is made from a special blend of nickel and stainless