|Maxed out a car!|
For a car to be maxed out, you need all 4 prototype upgrades. The 4 upgrades are Power, Control, Weight, and Extreme Nitro. What I did was buy 10 of the cheapest cars (which was a Silvia for about $15k) install the prototypes, and move on. Don't sell the cars until you have maxed out all 10.
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