Whether you ride on the track or the street installing the GB Racing Engine Cover Set is something we recommend. OEM engine covers are vulnerable and can be damaged in a race track crash or a simple driveway tip over. When this happens your ride is over unless you have an engine cover in your pocket. GB Racing Cover Protectors bolt right over your OEM covers to help reduce the possibility of being damaged. Secondary Engine Cover: Pulse/Timing - STOCK Revolutionary new tough, high-impact composite material made from 60% Long Glass Fibered Nylon Bolt on product allowing fast and easy removal and/or replacement Designed with aesthetics in mind and priced to be competitive with the existing products on the market