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Old 06-02-2012, 08:57 AM   #6
220 Kph, E39 on Autobahn
Join Date: Feb 2011
Location: Mississauga
Posts: 36
When I bought my 328, it had these bosch plugs which had four prongs open centre, the size of the anodes and cathodes were the same as convetional ones as these were not platinum. I replaced mine with iridium after doing some research, and the engine was more responsive, ran smoother, i found myself shifting 500 rpm later under normal driving. So I will recommend them for a NA car, but as mentioned I can't comment on boosted applications.
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