Excellent product. Provides a very secure and tight connection. Has some stretch to smooth out small imperfections. The only complaint (which isn't a problem if your port is hidden or has a large diameter) is the large clamp flange and hardware. The bolts are quite large (15mm?) which means the clamp flange needs to be a few mm wider. Since my bike's tubes are only 2" outside diameter, the 17+ mm flange is very noticeable! If it weren't for the small gap to the rear swingarm, the clamping flange could be hidden in the exhaust pipe. Could have been avoided entirely if I compared the product dimensions with the compared to actual clearances so I can't fault the product or the seller Overall a great product if you take the time to properly measure the diameter and check the gaps prior to assembly.