I just purchased a WB Pro-Meg for my 400ex. I had it on and was beginning to fine tune the carburetion when I noticed a leak between the megaphone and the muffler where it is rivotted together. I took it back to Rocky Mountain ATV (great place) and they told me that WB does not do a swap, but instead wants the system back to look at it and either replace or repair it. This was kind of a bummer as I now have to wait up to 4 weeks to get it back. My question is this, while I was there, one of the guys told me that another person had a problem with the rivots actually coming out after riding his for a while. Has anyone else had this problem? I love the pipe, but I don't think I want to have one if I will be having problems down the line. [img]i/expressions/face-icon-small-sad.gif[/img]