Welcome. Here's all that you need to maximize the stock turbo and improve driveability:
1. Upgraded Rear
Motor Mount
2. Upgraded Intercooler
3. Cobb Accessport
4. Flash Tune from Stratified or Dizzy Tuning for the fuels you have available (91/93, E30 ethanol blend)
If you want more noises (no performance benefit using stock turbo):
5. Upgraded Intake
6. Catback exhaust
If you track the car:
7. Mountune Radiator
Other non-necessary items (that make the car more fun):
8. Short shift kit
9. Chassis/Traction bars for added rigidity