The negative reviews here are very misleading, and are mostly about the seller; this product is exactly what it is supposed to be, and is exactly the size that Dynomax says it is. People get irritated at AutoPartsWAY for inaccurate descriptions, and that is a problem ALL the time. I simply do a Web search for the part number, and search AutoPartsWAY for that number; their descriptions are terrible. BUT that doesn't mean that products deserve a negative review; this is a quality product that fits just fine over 3-inch pipe, and the clamp is very heavy duty and high-quality. If you are dissatisfied with a seller's description, including AutoPartsWAY, those comments belong in the Feedback area, NOT here! I am a very picky certified technician, and don't give out 5-star reviews in abundance, but this is a nice tip, and looks great on my rig!