I'm not really sure anyone makes an aftermarket chassis for the RS4 2 in anything other than aluminum. But scratched chassis are just the nature of the beast. Since the ride height is so low, and they are usually driven on asphalt, they are all going to get scratched up. I have an RS4 3 and I just stripped all the purple off mine, polished the top side and left the bottom natural. Now the scratches dont show as bad.