paul said:have a play about with the intake?
get little things to increase the breathing before you go messing with turbos etc.
i need to find out where can i buy these performance parts .. please post me some links so i can decide what to buy nextSteveC said:you shouldn't need to touch the manifold.
A good quality induction kit like the Apexi one is a good step. you could try a panel filter.
The next obvious one is cams and pulleys then you should be ready for new turbos.
Bigger brakes are always good, if you can brake later then your laptimes are significantly inproved..