Since you quoted that post about a very low rear wing, that reminded me that the BMW Z8 can have a low fitting wing too.
While you were able to fit a wing within a wing on the Ford RS200 back in GT5, with the custom wing option you can now fit it in nice and snuggly. I like it.
Personal opinion of course, but I think the AAR Cuda fitted with mods is one of the best looking cars in the game.
Last bit, sorry all for a picture heavy post. While I was having fun in a tuned Clio RS, it seems I ended up with a lot more weight reduction than I anticipated!