DEI Exhaust Wrap 2in x 100ft - TanGlass Fiber Exhaust Wraps solve the problem of extreme underhood heat and improve exhaust system performance. An important first step in reducing unwanted and power robbing under hood heat is wrapping headers and down pipes. Less under hood radiant heat results in a cooler air charge for improved performance and keeping exhaust gases hotter within the exhaust system helps in decreasing exhaust density & increases exhaust flow. Design Engineering