Armaspeed Carbon Fibre Air Box CoversCarbon fiber is tough without getting bogged down like steel or aluminum, and its one of the strongest of all commercial reinforcing fibers, making it perfect for applications in engine modification. And it has a low coefficient of thermal expansion, meaning that it is less likely to change shape when exposed to heat than other materials. Also, it is naturally resistant to oxidation which means it is well suited for places where it might be exposed to