Perfect for what I needed. However, I hate the label, it's difficult to peel off and almost impossible to remove all the sticky dirt afterwards. Prepare some slime or fool (something stronger than plain acetone) if you need a clean install. 2.5" ID to 3.0" OD, use this to connect a 3.0" ID muffler to a 2.5" OD system by threading two Walker/Dynomax stainless steel band clamps (lapped) in of appropriate size to obtain a stunning, clean, leak-free exhaust that can be completely disassembled at will.