Thermo-Tec 11031 1" X 50' Copper Exhaust Wrap Generation II Copper Exhaust Wrap creates more horsepower and reduces under-hood temperatures, increases exhaust scavenging, withstands continuous heat up to 2000 degrees Fahrenheit and contains no asbestos Wrapping headers maintains hotter exhaust gases that exit the system faster through decreased density Thermo-Tec exhaust wrap will not over-insulate a system when properly installed