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Reducer/Expander
For Clamp-on 2.5" ID to 3" ID Exhaust Pipe Reducer Connector 304 Stainless Steel | eBay
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Exhaust Adapters & Connectors - Advance Auto Parts
Grand Rock Exhaust R3I-25IA 3" ID x 2.5" ID Exhaust Reducer Aluminized
SureBilt 2 3/4in Exhaust Connector
3" To 2.5" Exhaust Reducer Connector Adapter Pipe Tube Stainless Tapered Standard - Walmart.com