Our billet spark plug cover not only looks great, it severs a purpose! When using Honda CBR coils or AEM coils, the coils have a tendancy to work their way off the spark plugs, eventually resulting in a misfire. This cover holds down the coils with mil spec rubber stoppers attached with stainless steel hardware. No more stuffing red rags under the factory cover to hold the coils down! The cover is made to OEM dimensions so it has the same taper as the factory cover, sitting flush on top and bottom. Rubber stoppers are removable for non coil on plug setups, spark plug wires will fit like stock and still give you the option to upgrade down the road. B series VTEC engines only.