Inliners International Forums General Discussion Bench racing What is the ultimate inline six?

The BMW 3.5l (s38b35) , 3.6l (s38b36) and 3.8l (s38b38) DOHC inline six deserve some mention here. Early versions are known as the M88/1 engine installed in the BMW M1. These engines were available in the M5 and M6 models marketed between 1983 and 1995.

In street european form they cranked out 286 HP, 315 HP and 340 HP respectively with a redline of around 7000 RPM.

I believe these to be some of the most powerful inline 6 engines offered in a passenger vehicle.