3 Inch to 2.5 Inch OD Stainless Standard Exhaust Pipe Connector Adapter Reducer - Walmart.com
Rol-Tech 548540 2.5 x 2.125 in. Tail Pipe Reducer Adapter - Walmart.com
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R4O-25IA 4" OD to 2.5" ID Exhaust Reducer Aluminized
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