In 1997 a more powerful 6-cylinder engine was added. The 2.8 L engine (M52B28), similar to the BMW M52 straight-6 in the 328i except with an all aluminum block and head, was especially desirable with its 189 hp (141 kW). The M Roadster appeared in 1998 with a 3.2 L S52B32 engine (North America) or more powerful 3.2 L S50B32 engine (International). In 1999, the 1.9 L 4-cylinder engine was replaced with a 2.5 L straight-6 M52TUB25, producing 170 hp (130 kW) in North America. Due to marketing, BMW wanted to differentiate the 2.8 L engine from the 2.5 L engine, so it was badged 2.3 just like the 3-Series 323i, which also has a 2.5 L engine. Outside of North America, the 1.9 L 4-cylinder was replaced with a 2.0 L straight-6 in 1999, with 148 hp (110 kW).
raso kad '99 metais 1.9 buvo pakeistas 2.0 6cyl varikliu o kebula pakeite irgi 1999 metais, bet as kazkodel manau, kad naujam kebule jau tikrai nebebuvo 4cyl variklio.
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