How To Make A Tier 3 Car A Tier 4 Car
This is much easier than you think. All you have to do is buy a lamborghini murcielago. Then buy all of the upgrades and your lamborgini is ready for tier 3. This works just about all tier 3 cars. Good Luck!
More tricks, tips and cheats for this game are right here - Need for Speed: Shift cheats
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