GTR is a sports car racing simulator developed by SimBin for the x86 PC. An Xbox version was announced very early on, but never materialized. In April 2006, an Xbox 360 version was announced. The Xbox 360 version of the game was to be published by THQ. However, THQ later announced they would no longer be working together with Simbin on the title. Race Pro was released for the Xbox 360 in February 2009.There are more than 20 models of car included, spanning all the classes involved in FIA GT racing. They range from 600 hp GT class, to 400 hp NGT class vehicles. Other classes included G2 and G3. However, with the ability to create your own content, more vehicles have been created by the GTR community.