Keep Your Engine Cooler and Go Faster. Reduce Under-hood Temperature for up to 60% This is an old racing trick. Moving high heat from under the hood will make your engine work better. Your engine gives up 1% of power for every 10 degrees in temperature rise. By removing excess heat from under the hood, you will preserve engine's electrical components. These components usually increase their resistance to an electrical impulse, due to the rise in surrounding temperature, resulting in some lose of energy. Flexible heat shield will cover exhaust manifolds & protect components from heat. Made individually by 9xauto for all 924S/944 cars, heat shields two-ply material is composed of an aluminum layer as well as thermal-carbon woven. The heat shield is riveted into the aluminum bar, which in turn, mounts into the existing holes on the antifreeze rail above the header. (See Picture) This shield will also wrap around the header, creating a barrier between the header and the oil cooler. Installation requires no drilling, and two mounting screws are supplied. This shield is an important addition for the cars with an internal air intake.