It's basically the option to paint that part of the car Silver that's all. If you like black then all the better. As KWScott said, the frame (tridion safety cell) is always there, that is literally your car. Your not buying an upgraded frame or anything, it's just saying that you can pay them extra to paint it silver.. maybe they assume silver is a hotter choice so they charge for it. Well for me it's a marketing thing since they still have to paint the frame either way.. painting it black or silver doesn't make much of a difference but yea..

Just to clear it up for people who were confused
Larry