B8/B8.5 Front brake piston areas?

Anyone know or have a source for the area of the piston on the stock front brakes and/or a braking system that’s designed for these cars (like stoptech, etc).

Wondering how much something like ECS’s Porsche 19z conversion with 365/380mm rotors would change brake bias. From what I’ve found the Porsche calipers have piston areas of :

17Z - 3060mm2
18Z - 2750mm2
19Z - 2956mm2