Camaro, Firebird, LS1, and GM Performance Picture by 99 Black Bird T/A | 23722410 |

My old Mufflex Y came with the dual Flowmaster 3 inch to 4 inch collector. Had a reduce for the 3inch catback. Would have been easy to do 4 inch cut out then do the reducer.

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99 Black Bird T/A January 14, 2022

My old Mufflex Y came with the dual Flowmaster 3 inch to 4 inch collector. Had a reduce for the 3inch catback. Would have been easy to do 4 inch cut out then do the reducer.

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