Yoshimura Sound Insert Kit 99Db R-77 Muffler Cf Tip, 1.500" (Ins-04-K)Yoshimura Sound Insert Kit 99Db R 77 Muffler Cf Tip, 1. 500" (Ins 04 K) Replacement Low Volume Insert Kit for R 77 Mufflers with Carbon End cap Available as optional kit on applications requiring different sound restrictions Decibel reduction depends on application Kit Includes: Low Volume Insert Tube End cap collar Set screw This product was designed to fit on a standard equipped motorcycle, as delivered from the factory. OE and aftermarket