What do you with it? What upgrades if any? Maybe you simply pay it off?
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I fully upgrade the car with every practical and impractical upgrade I can manage. Then I scrap and/or cannibalize it order to harvest components for a time machine. With that, I'll travel 500 years into the future to find a warthog (if time doesn't allow for the development of an actual Warthog LRV, I'll still steal a car equivalent from 500 years in the future) and take it back home. And that is what I'd do with a blank check.