I did this a long time ago on my car. I was experiencing a spongy pedal after DE sessions even after adding cooling, etc. The stock brakes still stopped the car adequately, but the brake pedal was unnerving. Moving to the Carrera calipers essentially solved the problem. It's not a night and day difference, but if you need just a little more thermal capacity, the Carrera brakes are nice.
I did not add any sort of proportioning valve and didn't suffer any adverse consequences.
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Mike
1976 Euro 911
3.2 w/10.3 compression & SSIs
22/29 torsions, 22/22 adjustable sways, Carrera brakes
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