About Gran Turismo 4

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Hints:

For quick 200 A-spec points:
Buy a Buick GNX (USA).
Buy and equip all parts.
Buy a wing and racing rims of your choice.
On the GT mode screen, go to Original Circuits, then Autum Mini Ring, choose the fastest difficulty.
Go to the settings make sure everything is unequiped except R5 ties. Be sure to set wings to 0 (you'll never go fast enough to make significant downforce in a turn so there's no need to add wind resistance in the short straight).
Every car is much rated higher than the GNX for points. But, due to the GNX's natrual asperation (no turbo or EFI lag), weight reduction, stiffness, and grippy racing tires, you have a slight advantage over all other cars where it counts (there's no long straight where all other cars would surpass double your speed). Cut corners, drive well, you'll win.