It took me at least 8 hours to get it from its standard 252 MPH top speed it gets with all of the top performance parts, and no fiddling with gear ratios or anything

Not only that....adjusting the car's ride height affects top speed and acceleration, too

My absolute FAVORITE part about the game is fine-tuning the gear ratios of a fully-tuned, supercharged turbo monster of a car, and trying to get every last ounce of power out of it for a top speed at the Test Track