The XM is a big deal, or at least that's what BMW wants it to be. The first dedicated M model since the mid-engined M1 supercar has big shoes to fill. However, it's sparked controversy because of its unusual design, massive curb weight, and huge asking price. We can all agree it couldn't be any farther from the M1 even if it tried. Well, the two do have something in common—an inline-six engine.
