In Reply to: iridium plugs for Bmw, check the dynotests and the posted by Bill R. on August 01, 2001 at 13:09:49:
If you really want to get the most power out of your ignition system, then you must upgrade your ignition system to Jacob electronics and alikes. They will then tell you to run regular spark plug with increased gap so their igntion coil will be producing the maximum output of 40K+ volts. The more voltage = more power. Jacob electronics also have multiple sparks per cycle so it is doing the quadruple duty of stock ignition system... double power and multiple sparks instead of single spark.