CSI isn't just the name of a glitzy but ultimately insipid police procedural, it's also that of today's Nice Price or Crack Pipe BMW. Let's see ... the back and some deep dish BBS alloys.

In many ways, the 635CSi ... handling BMW since the M1. It is poised (if occasionally porpoisy and undershocked) when called to heavy duty, and it's stable over endless stretches of deep throttle.

The new owner made a host of modifications, the most significant of which saw the standard engine replaced with the 3.5-liter M30B35 inline-six of a 1988 BMW 635CSi. Moreover, this engine was ...