See a lot of people say that wrapping your headers doesn't matter. From my experience I can say yes. The difference isn't that the car magically gets cold, it's that the temperature drop is real. My legs no longer burn and it's cooler in my cabin. I wrapped my two long pipes and it worked for me. However, there are two things you should be aware of. Firstly, if you're wrapping headers like me, make sure you buy about 100 feet. And secondly, and this is the most important thing in my opinion, MAKE SURE YOU CLOSE THE BODY WHEN CLOSE THE EXHAUST! Look, the fiberglass in this film is torture when it hits the skin. It took me 3 days to get it out of my hands..." It felt like prickly needles were piercing my hands and front. just be careful But the movie works great. I'll probably buy more and pack my X-Pipe.