Watch a 2,000-hp Nissan GT-R thrash Lamborghinis to win "King of the Streets"

In theory, building a unlimited street-legal race car is pretty simple. You add parts to boost horsepower, run until something breaks, fix it and repeat. In practice, massaging machines up to 2,000 hp out of regular production models requires years of dedication and a high level of engineering expertise — which is why head-up racing events like the Texas Invitational often feature the same handful of shops battling for top prizes.