If you guys are looking for brake upgrades start w/ the rotors
calipers can give varying amounts of torque to the rotors but the stock A or S & M have adequate torque, they do suffer from heat issues when used at track events, that's where oe brake setups using '78 up 930 size rotors shine.
All modern calipers have mechanisms to fully control the pad
thru 993 Brembos used ss plates like what Walt added to his
later monoblocks use a spring and locating pins
here's a 993tt/Rs Big Red and a 996tt Big Red
As Walt mentions you do want differential sized pistons , smaller leading, or taper wear becomes an issue
All things considered there are much better choices than Bremteks