For 4100$ I believe you get the full Porsche brakesfrom a 993.
The kit you refer too is a lot less than that and is only for the front with the Boxster calipers and it uses the Kerscher vented rotors. I checked at aircooled.net but it seems those items are not listed anymore.
You can get the Kerscher fronts for about 600$ shipped and the rears for about 700$ from Germany. Not sure how much they are at CSP USA.
Alex
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