The Z4 M comes from one of the ugliest bloodlines of all time!!

The way I see it;

If you already have the M5 and you are selling your 360 CS.

Stick to a Club Sport, in which case the only option is a 2nd hand GT3 CS. It will cost you next to nothing to run and it will sit side by side the 360 on a track. Not to mention the price won't drop as much as the Z4.

Do you remeber what happened to this ugly duckling??