Brakes on mk1 gti with 20vt

I currently have standard drums on the back and g60 callipers with mk2 gti pads on the front.

I want more stopping power, can anyone suggest a better brake upgrade?

Cheers

James

What wheels are you running?

ill get shot for saying this but i replaced all the 8v brakes with new items and adjusted the brake bar and my brakes stop me on a penny mate

although i will be upgrading to vectra brakes shortly

What master cylinder and servo are fitted ?