Check the listing for details. 2.75" ID to 3" OD 12" Long Universal Exhaust Pipe Adapter Coupler Aluminized. Color: Silver, Condition: New. Listed at 29.99 USD. 2.75” ID to 3" OD Universal Exhaust Pipe Adapter Features: I.D. Size 1: 2.75 inch - 2.75” – 69.85mmO.D. Size 2: 3 inch - 3” – 76.2mm Length: 12 inch - 12” - 304.8mm Material:Heavy Duty 14 Gauge Aluminized Steel NOTE: This adapter is commonly used on 1988-2018 GM Half-Ton Trucks to adapt the factory intermediate pipe to a 3" inlet muffler. This includes: 1x AluminizedSteel Adapter This pipe is made from a high quality high aluminized mild steel for a long service life. This adapter can be trimmed to desired length by cutting unswelled end. This can either be clamped or welded to your existing pipe. Typically, pipes are measured by their outside diameter (OD), so you would want to select an adapter or coupling that has an inside diameter (ID) matching the OD of your pipe.On the other hand, components are generally measured by their ID, so you would want to select an adapter or coupling that has an OD matching the ID of your component. *DISCLAIMER* Adapters are subject to human error due to them being hand made here in the USA.Adapter sizing can varyslightlyand we do notguaranteethat the product will fit any certain way on your project.While efforts are made to ensure quality and consistency, cuts may be imperfect as well as expansions or indents caused by the manufacturing process may be present. We do not accept returns on any modified or used products.