Following up on the E31, it seems smart to look at its predecessor. As iconic designs go, the E24 has to rank pretty high on most German car enthusiasts’ lists. The lines are pure and classic – a long hood line with a chiseled front end, delicate and subtle wheel arches, a sweeping greenhouse and a flowing trunk line. It just looks right – the front of the E9 that it succeeded was equally as classic, but I have always felt that the back of the 6-Series was prettier than the car it replaced. It took elements of some classic BMW designs that preceded it and incorporated them flawlessly with updates for a new time. By 1970s standards, it was a very clean design – consider what was coming out of Detroit during this time period, and you’ll understand why the 6 still looked reasonably fresh a decade on in the 1980s. But for my money, the prettiest of the 6s are the early Euro cars, unencumbered by the DOT bumpers. Early on, though, the 6s suffered from not much performance – the engine lineup was effectively carried over from the previous E9 platform. That was solved in 1978 with the launch of the 218 horsepower 635CSi; a 5-speed transmission, deeper airdam, and black rubber rear spoiler with model designation indicated the higher performance of this model. The 635 officially wouldn’t come to U.S. shores until much later in 1984 with the E28 updates in place, but for a time this was the highest-performance BMW coupe you could get. Finding early examples that are still in prime shape is quite tough these days, but there’s a lovely example on eBay today in Pennsylvania: