I have no idea where I found this weeks wallpaper, but it has been sitting on my harddisk for a few months now. It is a Yonmeri Skyline by Liberty Walk:

Liberty Walk Yonmeri Nissan Skyline C110

Some people may have recognized it already, indeed it is the same Skyline as in the badboy search polls. I'm not 100% sure about it, but it looks like the pictures in the polls were taken earlier than the ones from Liberty Walk.