Wrap your headers with Thermo Tec`s exhaust jackets and cut your underhood temperatures by up to 70 percent. And as we all know, a cooler engine compartment can give you extra horsepower. The jackets are split down one side, wrap them around your header tubes, cut them to fit with ordinary household scissors, and then secure them with the included crimp lock fasteners and snap straps. The jackets allow for header expansion and can withstand temperatures of up to 2000 degrees Fahrenheit.