HKS Carbon Engine Cover Toyota GR Yaris / GR CorollaConcept This is a performance & custom part that replaces the stock engine cover. By using twill weave carbon, the interior of the engine compartment can be upgraded to a luxurious space. The sound insulation material installed on the tail of the stock cover can be transferred to ensure the same sound insulation performance as the stock. Features The HKS engine cover is designed to reduced turbulence in the engine compartment compared to the stock