S&S Cycle Single Bore Tuned Induction Air Cleaner System Chrome with Red Filters 170-0086 A performance intake is a must to get the most out of performance exhaust, cams, big bore or stroker kits. High flow washable and reusable cotton media provides performance, protection, and economy. Bolt-on performance - over twice the filtering area over stock intake system. Smooth intake tract of carefully selected tuned lengths increases performance. Increases horsepower and torque across the rpm range using air column inertia and carefully timed gas dynamic pressure waves.