[rlesko]

Consider simply painting your grey Brembo calipers and installing rear 2 piston brembo calipers. There is an abundance of information on this if you search around. The difference between 340mm and 370mm rotors is nigh-irrelevant for non-track use (pad is the same for both).

Find a used set of rear brembo calipers on eBay, Facebook, junkyard, etc. paint them to match your fronts with a specialized caliper paint product. Rebuild if necessary (replacing seals* and/or bleed nipples).

With some elbow grease you can get a mint brake set up for well under $1k.