McLaren Automotive is offering detailed specifications regarding the MP4 12C GT3 racer, a car born from the collaboration with McLaren Racing and CRS Racing which features F1 technology and has been homologated for competing in 2012.
Built for the FIA GT series the McLaren MP4 12C GT3 has been extensively tested at the Navarra circuit in Spain, while the first official debut was at Silverstone in UK.
Besides the  numerous motorsports derived adaptations which include a more aerodynamic body (fully made from carbon fiber), a stripped down interior, upgraded brakes and suspension, improved steering and weight distribution, the McLaren MP4 12C GT3 has also received a Formula 1 steering wheel mounted with paddle shifters that operated the
6 speed sequential transmission.
As we previously mentioned, the McLaren MP4 12C GT3 extracts power from the same 3.8-litre twin turbo V8 as the road going version, which in this case will be limited to 500 PS instead of 600 PS in order to create the perfect balance between output and weight.
For complete details regarding the McLaren MP4 12C GT3 check out the full specification list below.

McLaren MP4 12C GT3 Video :

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McLaren MP4-12C GT3 Technical Specification

Width (mm) 1995mm
Height (mm) 1145mm
Wheelbase (mm) 2670mm
Fuel tank capacity 120 litres
Chassis/body McLaren carbon fibre MonoCell with aluminium front and rear frames and bespoke carbon body panels
Aerodynamics Front and rear diffuser, front splitter, dive planes and adjustable rear wing.
Transmission 6 speed sequential using actuation via steering wheel mounted paddles
Limited slip differential with a range of ramps and adjustable pre-load.
Wet sump
Sintered clutch hydraulically operated
Driveshafts with tripod joints
Engine type V8 twin turbo McLaren M838T
Engine capacity 3.8L
Bore x Stroke 93 x 69.9
Max. Engine speed Limited to 7500rpm
Cylinder block Cast aluminium , 90 deg V angle, dry sump scavenge, Nikasil coated liners
Crankshaft Forged steel flat plane
Pistons Forged aluminium
Conrods Forged steel
Cylinder head Cast aluminium with plastic composite cam covers, inlet & exhaust variable cam timing
Valvetrain 32V with 40 deg variable cam timing on intake &
exhaust. Low mass with sliding contact end pivoted pinger followers,
single variable rate springs and hollow cast chilled iron camshafts
Intake system Two water/air charge air coolers. Plastic composite plenum.
Exhaust system Cast stainless steel exhaust manifold with compact MHI fixed geometry turbo chargers.  970 deg C turbine inlet temperature.
Fuel system Returnless fuel rail with twin fuel tank mounted pumps and twin spray injectors
Engine management MESL TAG400 ECU & CIU 100
Interfacing with Bosch ABS and Shiftec control units
Wiring harness Modular installation: Engine, chassis, fuel cell
Lubrication MOBIL1: engine and transmission
Cooling Air/water heat exchangers for engine water and charge
air cooling combined with water/oil heat exchangers for engine,
transmission & PAS.
Front axle SKF integrated axles with handed single wheel retaining nut
Rear axle SKF integrated axles with handed single wheel retaining nut
Front suspension Double wishbone adjustable for ride height camber and toe
Rear suspension Double wishbone adjustable for ride height camber and toe
Dampers Coil over Multimatic dampers with DSSV technology with independent bump and rebound adjustment
Front brake system Akebono 6 piston monoblock calliper
378Ø x 36mm Iron ventilated disc
Rear brake system Akebono 4 piston monoblock calliper
355Ø x 32mm iron ventilated disc
Steering Electro-hydraulic PAS
Wheels Forged Aluminium
Front 12” x 18”
Rear 13” x 18”
MESL TPS system compatible
Cockpit electronics Multifunction steering wheel with integrated driver display
Central switch panel with systems display screen
Steering wheel Derived from MP4-24 Formula 1 wheel retaining integrated driver display, paddle shift and switches
Source: McLaren Automotive