The Mercedes-Benz SLK320 was a variant of the R170 SLK-Class that was introduced for the 2001 model year. The SLK 320 was the only R170 variant to feature a naturally aspirated V6 engine. These cars were equipped with Mercedes' M112 E32 unit, which was a 3.2L V6 that generated 215hp. This power was sent to the rear wheels via a 6 speed manual or 5 speed automatic transmission. Production of the SLK320 ended in 2004, with a total of 33,416 examples built.