Aston Martin has upgraded its customer competition car, the Vantage GT4 V8.Based on the company’s road-going V8 Vantage this 4.7-litre racer is eligible for all FIA GT4 formula sanctioned events. These include the British GT4 and endurance championship, Dutch supercar challenge and VLN endurance championship at the Nurburgring. In production since last year, the Vantage GT4 gains a few technical upgrades for those racers wishing to dominate their respective championships next season.The regulation aerodynamic improvements are all borrowed from Aston’s V12 Vantage racer, which debuted at the Nurburgring 24 Hour last year.A new front splitter manages to boost downforce and channel an ample supply or airflow to the brakes and radiator for cooling purposes. Around the Vantage GT4’s rump there is a new diffuser and reshaped rear underfloor section, improving high-speed stability and providing room for a higher-capacity transmission oil cooler. DRIVING AID SYSTEMS?Beyond the airflow management goodies, Aston Martin has installed an impeccably calibrated ABS and traction control system supplied by Bosch to the 2011 Vantage GT4 – a feature which should greatly improve damp weather qualifying performance. Though Aston Martin remains mum concerning the exact power output of the GT4 engine, the company does admit to the V8 brandishing the usual track friendly free-flow exhaust and high-flow engine filtering systems. Considering the original 4.3-litre Vantage V8 racer, Aston’s N24, carried an 8% power premium over its road-going Vantage cousin, it is generally accepted that the 4.7-litre V8 GT4 is good for about 338kW.Featuring the road going Vantage’s dry-sump lubrication system, oil surge is not an issue with the GT4; even racing on extremely undulating classic European circuits which are popular on the GT4 calender.The racer, despite being 300kg lighter than its road-going sibling due to trim deletion, carries over most of the series production model’s components. Koni dampers at each wheel corner being probably the most important circuit-specific upgrade. Amongst the more interesting optional extras available for the Vantage GT4 V8 racer include pneumatic jacks, a sophisticated Cosworth data logging and system and perhaps most importantly, air-conditioning.