Certain race cars will use capacitor style spark plugs, but a race motor is a far cry from a stock ST motor.
Keep to the stock recommendation for replacement and you'll be fine. A stock ignition system with stock components won't benefit much from these plugs. Save some cash and spend it elsewhere.
Same discussion over on my Thunderbird Forums.. Consensus seems to be it is about as useful as the Tornado device, but no one wants to lay out $150 for a set of 6 plugs to confirm it...