^^ what he said, buy the OEM replacements, and have your coils checked out, you can do that with a simple ohm meter, chances are you are getting voltage to your ocils, but make sure they are a stable voltage, and check out some DIY sites to check the coils to see if they are in proper working order
As for alex dee's question, they might not crap out all at once, if 1 takes a poop, you only have 5 cylinders working, and that definately sucks, that also makes the other coils have to work that much harder because of 1 lagged cylinder, so in turn they go and take a poop too, slowly, but surely...
1995 325i- slushbox, cause i like it that way...
Soon2B- ??? - manual/stick cause i like it that way ?