To the uninitiated, the DB4GT was very similar to the standard DB4. But since values of GT's are currently three times that of the standard cars, we should expect a very different package indeed. The DB4GT was introduced in September 1959 at the London Motor Show, based on the race winning prototype, DP199/1. The car featured faired in headlamps and Plexiglas covers which continued through the range to the DB6 Mark 2 in 1970. Nowadays the DB7 and V8 Coupe/Vantage models continue to have headlights enclosed by a transparent cover. In order to save weight, the bodywork was of thinner 18 gauge aluminium, the wheelbase was reduced by 13cm, the engine was tuned and the rear seats were deleted on all but a small number of cars. Maximum speeds during testing at 153mph with a 0 to 60 time of 6.1 seconds. It was also one of the first cars that could go from standstill to 100 mph and then brake to a halt in under 30 seconds.

The engine of the GT still with a capacity of 3670 cc (though some had 3750cc), was otherwise extensively modified.  It featured twin plugs heads using two distributors (that's twelve sparkplugs in total) and triple twin choke 45 DCOE4 or 9 Weber carburettors9:1 and a compression ratio of. Power output was claimed at 302 bhp at 6000 rpm, a useful increase from the claimed 240 bhp of the standard car.

A single large fuel tank was fitted (although some cars had twin tanks in the wings) and quick release filler caps are situated on each side. GT's were fitted with spectacular lightweight Italian Borrani wheels, 42 spokes with light alloy rims.

The GT started and stopped with the DB4; the 5 and 6 were never tweaked and lightened for the race track. The DB7 GT made a brief appearance although never made production. Genuine DB4 GT's can be expected to change hands for an amount of approaching £150,000, more with racing history. One of the ultimate Aston Martins and a performance pinnacle of the marque