Updated: 24 June 2015

The car is a 1983 Audi Coupe Quattro Turbo, which has been painstakingly prepared to the Group 4 specification used by the Audi factory teams during the early 1980's.  The build commenced in 2005 and took eight years to complete using a combination of original Audi Sport parts and replica parts where it was not possible to obtain originals.

The body-shell has been extensively modified and strengthened in exactly the same way as the original factory rally cars, including seam-welding throughout, bolt-in tubular steel roll-cage with extensions through to front strut-tops, reinforced front-bulkhead, reinforced front strut turrets, removable tubular steel strut-brace with integral brackets for power steering and brake fluid reservoirs, removable tubular aluminium bracing to front inner-wings, removable tubular aluminium front chassis cross-bracing with integral mounting points for sump-guard, front radius arms, intercooler and auxiliary light brackets, removable tubular steel slam-panel,  full-length chassis rails with additional skid-plates, reinforced heel-panel with mounting brackets for rear radius arms, reinforced sub-frame mounting points, and additional brackets and reinforcement for chassis-mounted gearbox and rear differential.  The strengthened shell has been finished with light-weight (aluminium skinned / steel framed) front wings, bonnet, and doors, together with light-weight composite boot-lid, rear-spoiler, front/rear bumpers, front/rear wheel-arch extensions, front grille and sump/diff guards.

The engine is a dry-sumped 10v, with a balanced bottom-end, big-valve ported and polished head with a high-lift rally cam driving the rear-mounted power steering pump, large intercooler, high-efficiency radiator, tubular exhaust and uprated turbo.  It's currently producing 250 bhp and 240 lb/ft torque with just 10 psi boost, and should produce around 350 bhp with 300+ lb/ft torque once mapping is completed.

The transmission comprises a close-ratio semi-helical gearbox  with switchable (open or locked) center differential  and a ZF plated limited-slip rear differential.

The suspension and steering comprises of seam-welded sub-frames front and rear, strengthened front and rear wishbones linked to the chassis via rose-jointed radius arms, reinforced adjustable-platform struts all round with rose-jointed bottom-links and uprated springs and dampers, lowered steering arms with rose-jointed T45 steering links and a quick (2.5 turn) steering rack.

The braking system consists of AP 280mm x 25mm grooved/ventilated discs all round with AP Monte Carlo four-pot callipers at the front, Girling two-pot callipers at the rear with both mechanical and hydraulic handbrake, and adjustable brake bias.

The boot houses a 120 litre foam filled aluminium fuel tank, twin Bosch 044 fuel-pumps, fuel filter, dry-sump oil tank, battery and spare wheel, with the oil cooler mounted on the boot-lid under the rear spoiler.

Painted in the Audi Sport UK livery which Malcolm Wilson used in the 1982 RAC Rally, the car weighs just 1260 kg with full tanks.