645 versus 650?

[Megawatt1313]

I’m considering upgrading my 325Ci convertible for a 2006-2011 645 or 650. If it were you, 645 or 650 and why?

[jclausen]

650 but what I would really do is get the far less complicated e90 covertable

[White94RX]

650. Stay away from a 645. There were several improvements made to the N62TU over the N62. Most notably the elimination of the secondary air system, which has the propensity to clog, turning on the check engine light. Then the car won't pass emissions. It's major surgery to repair.