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Well, in the pics it shows the regular Pro Caps having the external post/socket for an external coil. The only thing different that I see is the Extreme has some sort of black plug/nub thats on the opposite side of the Pro Cap and the Extreme also has that thing to keep the plug boots from coming loose.
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Thanks, that helped me make my decision; Extreme it is!
btw, did you notice any improvements in part-throttle or idle?