VPW Aluminized Fiberglass Exhaust Wrap 25mm x 15m (50ft)ACE header wrap is a weave of the finest insulating materials, and can withstand temperature of up to 600 C. Keeping exhaust heat inside exhaust pipes maintains exhaust gas velocity, helps to increase combustion chamber scavenging and increases horsepower. Header wrap can also reduce bonnet temperature as much as 80% insulating both fuel and clutch lines, while protecting mechanic from injury.