I just got off the phone with Dinan in California. They are currently working on the software upgrade for the Z4 s35i. It isn't quite the same as the engine software for the 335, 135's etc due to computer/communication issues so it needs a bit of tweaking to work properly.
Full warranty coverage and an extra 80+ HP wil be available soon.
Full warranty coverage and an extra 80+ HP wil be available soon.