sorry for cross-post...
Thinking about possibly upgrading from my 16v to a C36 and I'm wondering exactly what are the differences between the early and later models and what year was the change? The only one I know of is 4speed/5speed transmission. Are the later models better/worse?
Also heard about possible head gasket woes and there is some kind of update for this. Is it easy to spot the update?Any other gotchas to look at in pre-purchase...

OK that's enuff... so many questions, TIA!