In 1997, Mercedes-Benz unveiled the CLK. Based on the C-Class, the CLK was introduced as a mid-size, entry-level luxury car. Mercedes offered the CLK in two generations: W208 (1998-2003) and W209 (2003-2009). The CLK was available as a coupe or convertible, and was offered with three different engines over the course of production (I4, V6, V8). AMG performance variants were available, as well as the hardcore CLK 63 Black Edition. Another notable special edition is the CLK DTM. Although it shares a name with the CLK, the legendary CLK GTR shares no components outside of a few exterior elements with its namesake.