Jardine QMI Quiet Module Insert for 2.00 Inch Tips Built to Jardines strictest standards and engineered for durability and performance Each system is dyno tested and racetrack proven with power-enhancing features such as smooth mandrel bends, taper-flowed tubing, race-style spring-tensioned slip-fit connections and jewel-like TIG welding U.S.F.S.-approved systems include a qualified screen-type spark arrestor that is easily removed via the billet aluminum end cap for closed-course competition QMI (Quiet Module Inserts) decrease sound output an average of 6 dB for an average of 93-95 dB; install in under a minute Canisters are constructed from CNC-machined billet aluminum with high-temperature silicone O-ring for proper sealing