With RB coil packs, the iron-core stack's black coating always ends up coming off / wearing away to some degree (under the bolt heads esp., plus eventually some is always pulled away by the mounting brackets when you remove the coils). Obviously this leads to a direct conductive contact with the aluminium bracket frame, and in turn all the rest of the coil packs. Does anyone know weather this can somehow reduce the strength of the coil, and/or contribute to misfire?, perhaps by encouraging a short to earth?