Optional QMI (quiet modules) available for most Jardine systems for 34.95 (each – part number either 18-QMI1 or QMI2. if unsure, ask and we will get the right size for your Jardine motorcycle exhaust ). Constructed from aluminum billet and CNC’d to exacting tolerances, the easily-installed module features a “red” high temperature silicone O-ring to assure proper sealing. Decreases sound levels an average of 6-8 decibels on race core equipped models. That correlates to an average sound level of 92-95 dbA with the QMI installed. Jardine has a history of building Performance exhaust systems for factory teams such as American Honda’s roadracing program. Every system is painstakingly made to exacting tolerances by skilled craftsman utilizing the latest manufacturing techniques. Beginning with our design team, we use Solid Works computer imaging as our baseline. It’s stronger, lighter, quieter and more powerful! Don’t take our word for it, just ask someone who’s raced one!