I don't know the answer to your question, but part of me thinks the AH3 may have different springs than a 335i in the rear, to account for the weight. You know those German engineers think of everything! I doubt they'd slap ~250 extra pounds on there and not compensate. Imagine driving a regular 335i with a couple of girls in the back. It's probably going to look a bit lower. But when I see an AH3, the rear looks the same height as the standard 335i.
2016 M3 - on order for October 19th European Delivery
2013 ActiveHybrid 3 - current
2012 M3 coupe - sold