Quiet Insert, FMF Q4 & Powercore 4

WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Made in USA
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This Quiet Insert comes stock in all new FMF Q4 mufflers. If you lost yours, this is the replacement you need. It will fit Q4, Q4 Hex, Powercore and Powercore Hex mufflers. It will reduce the sound rating of the Power Core models, from about 99db down to about 96db.