ITEM NAME:4.0" O.D. to 2.5" O.D.Exhaust Pipe Reducer Adapter Connector Stainless Description: 4.0" O.D. to 2.5" O.D. Exhaust Pipe Reducer Adapter Connector High Grade Stainless Steel-T201 Thicker Wall (0.078†) To Be Used With a Variety of Applications Mandrel Bent For Smooth Flow and High Quality Appearance. Universal fit for all exhaust/turbo/intercooler/intake piping connection Specification: Product Name:Exhaust Reducer Connector Pipe.4.0" O.D. to 2.5" O.D. Exhaust Pipe Reducer Adapter Connector. 1 piece Exhaust Reducer Connector Pipe Tube. Universal fit for all exhaust/turbo/intercooler/intake piping connection. High Grade Stainless Steel-T201.