(http://media.il.edmunds-media.com/mclaren/mp4-12c/ns/mclaren_mp4-12c_actf34_ns_31111_196.jpg) CRS Racing teams with McLaren Automotive to develop a GT3 racing version of the British supercar. Among the more significant changes for the track are the addition of new aero body pieces, a new suspension and a new Ricardo racing gearbox. The twin-turbo 3.8-liter V8 from the production car has been race-tuned for the GT3 edition
Source: McLaren Tests MP4-12C GT3 Racecar (http://www.insideline.com:80/mclaren/mp4-12c/mclaren-tests-mp4-12c-gt3-racecar.html)