The biggest initial difference you'll notice between Gran Turismo 3 and Gran Turismo 4 is the graphics. Gran Turismo 4 has substantially upped the amount of trackside detail for some of the courses without sacrificing the quality of the car models. Gran Turismo also features better force feedback steering wheel support and a new online racing mode to make the next edition of Gran Turismo the best yet. Check back soon for more details and features!