Just a quick question....... Does the Z4 have bolt-on panels ala Z3, so (as an example) the 250 SWB kit could be bolted on in a similar way to the Z3.
In fact the Z3 and Z4 (if you squint) just look like a 'cosmetic change' - Is this the case? Forgive me if this is a daft question, but I know very little about BMWs.