One thing is certain: this 3.2-liter inline six is gorgeous – smooth, refined, subtle yet prodigiously powered. And it sounds terrific. Connected to a fluid six-speed manual that slips into each gear with a rubbery pop, the 2006 BMW M Coupe really moves. Launching the car in first gear can be a little tricky, since the clutch take-up is abrupt, but once underway and accelerating hard it’s easy to snap off quick shifts. The pedals are set up for easy heel-and-toe action – action we’ve never quite mastered. The M Coupe’s engine-speed sensitive hydraulic steering is a huge improvement over the Z4, connected to a thick, meaty steering wheel that people with smaller hands might not like to grip. The stout brakes respond instantly and let the driver squeeze exact amounts of pressure to the binders.