I'd love a new version of Street Rod. It's the only modding/racing game that I know of that's realistic enough to make you need to buy petrol for your car and repair it every time you have a rough race. None of the driving 300km/h with a trunk full of NOS and hitting a brick wall, only to bounce off and keep going like you do in all the Need For Speed games. I like being able to strip my bumpers off and chop the roof to make the car go a little bit faster, I like finding people to drag down at the local diner, and I love finding that next car in the classifieds section of the newspaper.
Street Rod was such a better racing game than most because it was about more than just racing, it was role playing too.