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The key to effective brake upgrades is maintaining brake balance front to rear, which the better kits do (think StopTech, Brembo, AP Racing, etc). Race cars work around this by having cockpit adjustable brake bias valves, but on a street car, you want to maintain the factory balance front to rear. So, if you increase braking power 40% up front, you need to add 40% to the rear.
The issue in upsizing only one end is that you have not only upset the balance of the car, but also the way the ABS system behaves.
As others have said, you do not need bigger brakes. What would be nice, would be be aluminum hatted floating rotors, but the stock calipers (even base) are plenty big enough. Run good pads and fresh, good fluid and you're fine.
Now, could you get Cayenne brakes to fit? Sure. You may or may not be able to use the rotors (not sure if the Cayennes use 5x130 or not, since they came from VW originally), so custom rotors may be required, then design and produce a mounting bracket for the caliper, and off you go. You would likely need 19" wheels to clear the calipers.
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Boxster S
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