How do you save weight?
I would suggest maybe upsizing the rotors to larger ones, and getting twin piston calipers...
Old VW's do this all the time. Grab the calipers, carriers and rotors off of a Corrado G60, and install on your Rabbit. You need at least 15" wheels, but it was worth it.
I don't know if there are larger brakes that bolt on, but you could research the mounting and find out.