All I can say is that this product works! When used correctly I find that it retains heat very well. I used this foil (plus silicone spray) to wrap test tubes on my 2010 Infiniti G37x. Before that, I even covered them with ceramics. While I can't speak for durability, I can speak for a slightly muffled sound (not as squeaky) and heat retention. I will update the review later if there are any durability issues or long term issues. The only caveat to my 5 star rating β is that #1. Be careful when putting on the bandage. Wear gloves and a mask and goggles! Don't be alarmed if your pipes smoke/burn after you install and light them - it just burns up all the paint, moisture and other fiberglass crap π