I just changed my plugs and tried the Bosch Platinums (they misfired) bought the NGK's and they we're gapped correctly at .041 I have a carbed B12 1987 E16s and .041 is from Chilton's table of tuneup specs.
I knew a guy, [yes, a "cheapskate"] that made his own "split-fire" plugs, by taking a chisel, and splitting the tips of the grounding electrodes on his stock plugs. What a genius! I remember him saying "I ain't payin' seven bucks fer a split-fire plug! :bs: