The S55 was a significant departure from the engines that traditionally powered a BMW M cars and replaced the final BMW M-car with a naturally aspirated V8 engine. The S55 debuted in 2013 and was the first mass-produced M Division engine with a turbocharger. However, devotees had nothing to complain about because the S55 was a fantastic engine and a good basis for the forced-induction engines that would likely power the M vehicles in the near future.