The first has to do with removing all the nasty JPG-ed-ness that is extremely visible is some shots. The other is a simple tut on creating wheel blur on an image where the wheels are either not spinning enough or not at all. The second tutorial is not limited to GT4 images, by any stretch. I have used these steps many times before on images of real cars, with great results.
Photo Mode Cleanup Tutorial
Wheel Motion Tutorial
"My photoshop-Fu is strong." - Me
Viva la libertad -- A Friend.