Thermo-Tec 11246 Exhaust Jacket Kit for 4-6 Cylinder The jackets cover the tubes vertically allowing for a consistent fit; the fit allows the exhaust system to expand as it comes up to operating temperatures without restrictions and provides air space for added insulation This product uses Thermal Conduction Technology (TCT) developed by Thermo-Tec and can be applied with the headers in the vehicle This TCT conducts heat across the wrap's surface which controls heat build-up and dissipation; the material is 8 inches wide and either 12 or 16 feet in length; the jacket can withstand continuous temperatures up to 2000 degrees Fahrenheit