Napa has M3 ignition parts. boots, plugs, coils, How do I identify the engine. I am told it has an E50 intake. I'm told its a 2002? eng. swap but don't want to assume. I hear E50, E52, E54, 5 choices of coil assemblies, 10 choices or more of plugs, 2 choices of boot, brands include plugs;Champ, Autolite, Ngk, plugboot; Altron, Belden, coil assy; Echlin, Altron, Delphi. This will help me fix the overhead clicking thats a current problem a slight miss is present. The coil at issue may still be good. There's no time to send off to a fancy German themed parts house at this time. Any recomendation's will be very helpful thank you. .... Is oil seepage in the plug wells common?