Porsche has unveiled its new Le Mans and World Endurance Championship (WEC) racer, the new Porsche 911 RSR.

The biggest news is that the engine now sits in front of the rear axle, a departure from the brand's iconic rear-engine layout. With the 503bhp 4.0-litre six-cylinder engine located further forward, this allows the car to be fitted with a large rear diffuser. Together with the massive wing, this allows the car to produce significantly more downforce. Power is sent to the rear wheels via a six-speed sequential gearbox, operated using steering wheel shift paddles. 

The midship location of the powertrain is also helps to improve the RSR's overall weight balance, and it comes as part of a complete overhaul for the racer that includes an all new structure, suspension and aerodynamic concept. The body is made out of carbon fibre, and attaches to the chassis via quick-release fasteners, making the vehicle easier to service as exterior elements can be removed with minimal effort. In line with LM-GTE class regulations for Le Mans and the WEC, the car's base weight is 1,243kg. 

New for 2017, the RSR also gets a radar-based collision system - 'Collision Avoid System'. Like road cars, it is an automatic emergency braking system that uses radar control, meant to help avoid major impacts during a race. This is especially pertinent when racing against faster LMP prototypes during WEC events. As per GT racing regulations, there's also a new multi-function steering wheel, LED head lights and taillights, and an air-conditioning system.