The Perfect car strategy
I have got the perfect car strategy.
All you need is the Hyundai Coupe (unlocked mission 18 or 19 in underground mode), the Honda S2000 (I can't remember what mission it is you unlock it at), the R34 Skyline (Mission 80), level 3 engine/exhaust, level 3 drivetrain, level 3 tyres, and every other performance upgrade at level 2.
Here's what you do: put all of the performance upgrades on your starter car. Then, trade it for the Coupe. The top speed bar of the Coupe should be almost full.
Then, when you get the S2000, trade the Coupe for the S2000. Then when you get the Skyline, trade the S2000 for the Skyline.
Then when you get all the level 3 performance upgrades, put them on the Skyline, and it will have a full top speed bar.
If you need more help, we've got more Need for Speed Underground cheats and also check out all of the answers for this game
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