Following on from the success of the Vitesse 1600 a new 2 litre superseded it in 1966 and was retrospectively known as the Vitesse 2-Litre Mk I. The new Vitesse used the same 2-litre 6 cylinder engine as the Triumph 2000 range and developed an impressive 95bhp. A stronger gearbox and twin Stromberg carburettors were fitted along with improved brakes.
As before with the Vitesse 1600 two door saloon and convertible versions were available, although the saloon proved to be more popular. The Vitesse 2-litre continued to sell well until the arrival of the better handling Mk II in 1968.