1978 to 1984 BMW 635 CSi had a 3.5-liter M30 inline-six engine, part of the "Big Six" family. From 1987 onwards had around 208 hp, achieving 0-62 mph in 6.4 seconds and a top speed of 158 mph, competitive with other supercars of its era.
1984 onwards an even more energetic “M”. series began:-
https://www.bmw-m.com/en/topics/magazine-article-pool/bmw-m635csi-top-model-of-the-e24-series.html#:~:text=The%20BMW%20635CSi%20first%20appeared,with%20a%20cross%2Dspoke%20design.














