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DynaFlex Quiet Muffler Middle Spool with Taper Lock Extension Brand_Valley Chrome It provides cutouts (holes) inDynaFlex Quiet Muffler Middle Spool with Taper Lock Extension Dynaflex's Quiet Muffler Available With Built In Silencer & intelligent Taper Lock design joins with a standard OD pipe which gives a seamless look to your exhaust stacks. Ignore the ugly bulges of expanded ID stacks and upgrade to a Dynaflex Exhaust *Fitment suggestions provided are most common but you must measure your exists center spool to determine length needed. *Center Spools