To get to stage 2+
Fuel pump 600-800
TBE ~1000 (or just DP for 400-500)
Intercooler ~400
Intake 300-400
Remap 400-600
And if its a manual... ~1000 for a clutch
.... ohh and then handling and brakes?
Coilovers +ARBs 1500
Brembo 4 pots 600-1200 depending on setup
So thats ~5500-6500...