Cold air feed.
Janspeed Manifold/Full system.
Bigger injectors?
1.3 Cams.
Just get a 1.3 micra?
Retard/Advance the timing?
ECU Remap?
Turbo?
Lose some weight? (The car, not you)
Lighter fly wheel?
Uprated clutch?
There's more but I guess it depends on how passionate you are to make it faster and how much $$$ you have to cover it all, good luck.