The orginal exhaust insulation wrap was developed over 20 years ago by Thermo-tec. Exhaust Insulating Wrap is an innovative way to create more horsepower and reduce temperatures under the hood. Wrapping headers with Exhaust Insulating Wrap maintains hotter exhaust gases that exit the system faster through decreased exhaust scavenging, as well as lower intake temperatures.Exhaust Insulating Wrap withstands continous heat up to 2000F , it contains no asbestos. Thermotecs Exhaust wrap will not over insulate a system when properly installed, due to its proprietary coating-Thermo-conductive-technology (T-C-M) specially developed by Thermo-Tec, that conducts heat across the wraps surface. This unique coating controls heat buildup and dissipation. All Exhaust Wrap has a low profile 1/16 inch thickness.