1. Make sure the engine is working properly
2. Intake
3. Exhaust
4. Fuel
5. Suspension
6. Brakes
7. Better/Wider Wheels/Tires
8. Bigger Turbo
9. Bigger Intercooler
10. Aluminum or Stainless Steel Intercooler Piping
11. Standalone
8-11 should be all at the same time. And for number 1, do a compression test. If any of them are under 120 psi or more than 15 psi apart, it's time for a rebuild. I left them vague purposely because everyone has different goals for their car.
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