Yoshimura FIM-Legal Low-Volume Insert for RS-4 - 1.500in. Diameter (INS-U-4) - INS-23-K

Spark arrestor inserts are U.S.F.S.-legal and include noise-reduction insert
Low-volume inserts are for non-spark-arrestor equipped bikes; reduce noise levels for AMA or FIM competition sound requirements
Fits Yoshimura exhaust system or slip-on noted in description
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