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Gran Turismo 4 cheats / Gran Turismo 4 hints / Gran Turismo 4 faqs / Gran Turismo 4 solutions Gran Turismo 4 hints Free Horsepower When you buy or win a new car, take it for an oil change. After the oil change, your car's horsepower will increase. Other Gran Turismo 4 cheats hints faqs solutions: 1. Gran Turismo 4 hints 2. Gran Turismo 4 hints 3. Gran Turismo 4 hints 4. Gran Turismo 4 hints 6. Gran Turismo 4 hints 7. Gran Turismo 4 hints 8. Gran Turismo 4 hints 9. Gran Turismo 4 hints 10. Gran Turismo 4 hints 11. Gran Turismo 4 hints 12. Gran Turismo 4 hints 13. Gran Turismo 4 hints 14. Gran Turismo 4 hints 15. Gran Turismo 4 hints 16. Gran Turismo 4 hints 17. Gran Turismo 4 hints 18. Gran Turismo 4 hints 19. Gran Turismo 4 hints |