304L Stainless Steel Concentric Reducer for Turbo Manifolds– Ace Race Parts
Amazon.com: 8SC82 Exhaust Pipe Reducer Component Adapter 2.5 Inch OD to 3 Inch OD 4 Inch Length Polished 304 Stainless Steel Universal 2.5"OD to 3"OD Exhaust Pipe Reducer Adapter-2PCS : Automotive