Amazon.com: Universal 2.5" ID to 3" ID Exhaust Pipe Adapter Connector Reducer 304 Stainless Steel 2.5 Inch to 3.0 Inch 2 1/2” ID to 3.0” ID kit : Everything Else
ECS - 65126 - Stainless Steel Exhaust Sleeve Adapter - 2.5" I.D. Mm To 3" I.D. - (NO LONGER AVAILABLE)
PLM 3” to 2.5” Exhaust Adapter Flange
Amazon.com: Exhaust Pipe Adapter, 2.5 inch ID to 3.5 inch OD Exhaust Pipe Adapter Connector Reducer Stainless Steel Pipe Connector Tube Car Accessories for Automobile Modification Exhaust Pipe Coupler Connector : Automotive
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Amazon.com: Universal 2.5" OD to 2.75" ID Exhaust Pipe Adapter Connector Reducer 304 Stainless Steel 2.5 Inch to 2.75 Inch 2 1/2” OD to 2 3/4” ID kit : Everything Else