I haven't "slammend" mine by any means, but I couldn't go any lower, I have just over a 1 finger gap between the actual metal arch of the car (not the arch extension) and the wheel. There are some speed bumps i can go over, and have been known to reverse away form them, with the sound tune of beeping horns reminating!!! you can see the rear in one of the pics, i would say its quite low!
I do wonder about my car though, not sure if anyone can help; it is a 1996 but a lmd edition German export (silver bullet). I understand it was fitted with 13x6 wheels as standard, would this mean that the arches had been "trimmed" as per the later sportspacks
Firstly love your mini it got that euro look a bout it fair play I wouldn't be Runing mine as low but want to know can you get full steering lock without rubbing and does your wheels hit of the inside of your arches or your extension's over bumps while driving normally