Undeniably, the 2006 BMW M Coupe’s fixed fastback roof works well with the Z4’s folded-and-creased exterior design, flowing beautifully into the raised rear deck and making that bubbly butt a logical conclusion rather than an irrational exclamation. Plus, thanks to the M Coupe’s hatchback design, there’s additional cargo space, though it’s still precious. Pop the hatch and you’ll find that the trunk is roomy enough for a couple of soft-sided duffels, or a medium-size rollaway and a briefcase. A handy cargo cover is also included to keep valuables out of sight, and there’s a light to help you see in the dark.