I was reading an article on car photography today which quite cleverly showed you how to get professional results with just one flash. The basic gist is to have a long exposure and then run around the car (off scene) aiming your flash and lighting up the car how you want before the exposure is finished. You can also do the inside of the car separately and then blend the photos. I never thought of this technique but quite fancy giving it a shot!
Sorry i keep getting an error message , If you want i have some of my best work on my website, you could check it out if you have a chance. Its www.gstlife.net, i'm from New York City and i love stanced and modified cars too i use to own a nice Flat Black 98 Honda Accord, lowered with stock wheels but i painted them powder white... i miss her.