Akrapovic Kawasaki Z1000 Slip-On Exhaust 2007-2008. The dynamic, bold looking roadster offers a great tuning platform for motorcyclists who desire something special. Our sporty and lightweight SLIP-ON systems offer a great balance between price and performance and represent the first step in the exhaust system tuning process. The muffler outer sleeve is made of titanium or carbon-fiber, which gives a special hi-tech touch to our SLIP-ON system. We also offer an open and a street legal version.