Thermo-Tec 11021 1" X 50' Black Graphite Wrap The Thermo-Tec wrap effectively improves the scavenging of exhaust gases by the headers from the engine's combustion chambers Wrapping headers maintains hotter exhaust gases that exit the system faster through decreased density Exhaust Insulating Wrap withstands continuous heat up to 2000 degrees Fahrenheit and contains no asbestos Thermo-Tec exhaust wrap will not over-insulate a system when properly installed