3-inch to 2.5-inch Exhaust Reducer - 304 Stainless-Steel– Ace Race Parts
ForgeFit® Stainless Tri-Clamp Concentric Reducer - 3 in. x 2.5 in. | MoreBeer
Amazon.com: 8SC82 Exhaust Pipe Reducer Component Adapter 2.5 Inch ID to 3 Inch OD 4 Inch Length Polished 304 Stainless Steel Universal 2.5"ID to 3"OD Exhaust Pipe Reducer Adapter-2PCS : Automotive