bosch makes excellent products dont get me wrong, but the multielectrode plugs of any make (splitfire etc) cause ignition timing problems in stock ignitions cuz the spark is going all over the place, not one consistent area. had a few bikes come in the shop (and a friend of mines chevy) w/ the plugs installed, wouldnt run. put the standard plugs back in would run fine, but every time we pulled a plug and watched it fire (which it did) it jumped from one electrode to the next and even shorted itself between two outer electrodes a few times, causing such a mis that it wouldnt even pop. another ignition issue ive run into is running IRIDIUM tipped plugs in ignitions that dont call for it. iridium is very resistent to corrosion of the tip, but is also a hellacious resistor to spark, unless your ignition is cranking some volts (which ford does not) its not recommended to run these. the same buddy w/ the same camaro put these in thinking it would help, the car did run w/ them. however, 3 months later he had to change the computer, and smoked 3 coilpacks. when the new computer was installed he noticed that after running 10 miles you couldnt touch the damn thing, took it to the shop and they said the plugs were pulling so much voltage throughout the system it caused voltage drop and shorted the system. we installed the recommended plugs again and no more problems. i asked how do you run these plugs they basically said upgrade your ignition to around 45k volts and youll run fine otherwise youll run into these problems. just food for thought from some expensive experience talking.
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