McLaren has announced full technical specifications of its MP4-12C GT3 racing model, which much surprisingly, has 100 horses less than the road car it's based upon. The racer uses the same 3.8-liter twin turbo V8 engine (codenamed M838T), but in a de-tuned state deliver 500 horsepower (down from 600HP) in order to ?provide optimum power for a performance-balanced race car,? according to McLaren.
Source: Carscoop