wrapped around the exhaust of my side X. Reviewed on multiple chat sites, this case seemed like the best choice. A lot of people have been talking about the cheaper fiberglass products and the need to moisten the foil to avoid some of them. It will also fall apart in a few years. Only wanted to do it once so spent the extra money. When I did this for the first time, everything worked great. It was a little tricky getting the exhaust out, but packing it up was pretty easy. He made it himself, so one person can do it. I was in a hurry so I didn't rush. I had to redo the first whistle, I didn't like how it ended on the whistle, but then I figured out how to do it best. I used metal zip ties to secure the packaging, it was difficult to tighten but I figured it out. Made a big difference in terms of heating.