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Part Number: 12-QMI3 Product Name: RT4 QUIET MODULE INSERT FOR 1-3/4" TIP Description: RT4 QUIET MODULE INSERT FOR 1-3/4" TIP UNIVERSAL The QMI is a sound attenuation device that installs easily in under a minute. The QMI allows you the option of substanially decreasing the sound level of your RT-Four exhaust system when you need to. Constructed from aluminum billet and CNC'd to exacting tolerances, the 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 equiped modles. That correlates to an average sound level of 92-95 dbA with the QMI installed. May require jetting change. Our Price: $35.00 Quantity: