A section called "Garage" under your aviator which links to a part in your profile showing details of your car, mods make and money spent etc.
It's on a couple of sites I've seen, like this for example
http://www.japmids.co.uk/forum/garage.php?mode=view_vehicle&CID=55
It's on a couple of sites I've seen, like this for example
http://www.japmids.co.uk/forum/garage.php?mode=view_vehicle&CID=55