Introduced following the factory’s competition success at events such as Le Mans & the Mille Miglia, the upgrades from the standard 100/4 were the result of years of motorsport development.
Visually, the most notable difference included a 40 louvered bonnet that was held down by Le Mans regulation leather straps, built by Warwick saddlers Frederick Freer & Co. Stiffer engine valves, beefed up front suspension and an aluminium airbox feeding twin 1 ¾ S.U. Carburettors all formed part of the factory offered upgrade package.