exterior mods program?

i was wondering if anyone out there knows of a website or software out there that i can see what mods will look like before i do them. kind of like the one they use on the fast and the furious. i want to see different colors, ground effects, hood scoops, lowering, rims, etc. i went to thetirerack.com and they let you see different rims on your car, that was kool but the car color choices were limited.

going to most sites that sell they give a pic of the installed kit

No such program exists. That was just typically Hollywood movie magic.

Besides looking at pics of a kit installed on company websites, your best option is to find a good photchopper and photochop the car. Someone god at photochopping can chop in different rims, lower the car, change the color, chop in new bumpers, etc. That would be the best realistic option.

photoshop otherwise no. but ther is this game but it aint much
http://www.newgrounds.com/portal/view.php?id=86910