im sure the brakes have been done before but ive heard that it is difficult, as for the more bhp out of a 1.0l, well you can start off with a manifold de-cat pipe or even a straight through pipe and a cat back system, you could then get ultimate/fast road cams, upgrade to 1.6 injectors & fuel rail, re-map your ECU or just go turbo lol it does take alot of money, just depends on how much your willing to spend