The first BMW M5, the humble E28 of 1984, had little idea of the performance bloodline it would sire. Its equally humble sales figures proved it: just 2,241 were built. Previous to the 2004 arrival of the E60 M5, the '84 original and the much better-selling E34 that succeeded it in 1988 both carried excellent inline sixes that offered between 256 SAE horsepower in the first-generation's North American trim and 340 European DIN horses by the end of its run in 1995. Good for their time.
Autoblog, 2012 BMW M5 (video)