The Austin-Healey 100M was a series of performance cars introduced in 1955 for the 1956 model year. The 100M was a high performance variant of the Austin-Healey 100 BN2, and it featured a range of performance improvements to the engine such as higher compression, a cold-air box, and larger carburetors, other components such as the suspension also saw improvement. While many of the components fitted to the 100M were available as an optional "Le Mans" performance kit, only 640 examples were built at the factory. Production of the Austin-Healey 100M took place until 1956.