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S&S Cycle Intake and Exhaust valves are high performance valves made from quality steel specifically for your Harley Davidson. These valves are very crucial components as they allow air/fuel to enter or exit the combustion cylinder. This therefore allows the air/fuel mixture to combine and produce power. The steel material used is heat treated making the valves strong and long lasting. The strength of these valves prevents the damages seen on most other valves when used for a long time. Installing these motorcycle intake or exhaust valves is not a complicated process as they are direct fit parts that do not require any modifications.