Gran Turismo 4 is a racing video game, and the fourth installment in the Gran Turismo series. It is also the final game to support the Sony PlayStation 2. Gran Turismo 4 is one of only four titles for the PlayStation 2 that is capable of 1080i output. GT4 was delayed for over a year and a half by Polyphony Digital, and had its online mode removed. The game features over 700 cars from 80 manufacturers. The game also features 51 tracks, many of which are new or modified versions of old Gran Turismo favorites, with some notable real-world additions.