BMW has been testing an M Sport performance pack for the Z4, hoping it will tempt buyers disappointed by the lack of a full-fat M version in the range.
A Z4 M is not scheduled for production, but the Z4 sDrive35i is no slouch, hitting 60mph in 5.1sec, and the M Sport package will make it a sharper drive.
Tweaks include stiffer suspension and larger wheels, which will give the Z4 a sporting edge, at the possible expense of a little ride comfort.
Restyled front and rear bumpers toughen up the looks of the Bavarian roadster.
Although the model seen testing at the Nurburgring is the flagship sDrive35i, BMW is expected to offer the package on all versions of the Z4.
Expect the M Sport package to be made available early next year.