The second generation of Austin-Healey 100 was introduced in 1955 for the 1956 model year. The second generation of 100 was known as the BN2, and featured the notable addition of a four-speed manual transmission. The same 2.7L inline four engine from the previous BN1 was used, but subtle changes such as larger front wheel arches and a new rear axle helped to separate the evolutions. The most notable BN2 variant was the high performance 100M. Production of the Austin-Healey 100 ended in 1956.