While it is a beautiful model, I'm just not sure how well it'd go as it is in GTA4, but then I've only seen the game played and not actually tried it myself. You still may want to save a second copy if the car, and tone down the detail on the wheels (You can quite easily get away with tyres having all of the faces along the width converted into a single face rather than 10), engine (Similar case) and lights for example.
In a racing game however, it'd go brilliantly.