Ken's Factory velocity stacks are designed for use on show bikes as they do not have an air cleaner. They feature internal breathers and fit with stock Keihin CV carburetors, S&S Super E carburetors and Delphi Fuel Injection throttle bodies and are available for 1993 thru 1999 Evolution Big Twin and 1999 thru 2017 Twin Cams with cable throttle. Does not fit the oval intake Marelli Fuel Injection. All CNC machined from billet aluminum by Ken's Factory and available in Ribbed and 5-Spoke designs in a polished finish or black anodized with clear cuts.