3D Printed Pistons Are Changing the GameWossner Comp Ratio 9.01. Round Style Riken Ring Gas Porting Three Ring. The seller is suzukiperformanceltd and is located in this country GB. Wossner turbo forged piston kit 9.01 80.92mm gsx1300r hayabusa 08-21 wossner believes in continued research and development so that the end user is guaranteed to always receive the most horsepower available from a forged piston.