They are height adjustable, but the xi's have reduced travel with shorter struts (due to accommodating the front half shafts as i've learned), they don't go as low as I figured they would, certainly not "slammed" if that's what you're looking for. That said, the drop is fine with me, like I said, around 1.25in and more importantly, hugely reduced body roll and much much flatter through the corners. The handling characteristics outweigh the surprise at only being able to lower 1-1.25 inch safely. You CAN go lower (probably around 2in to it's lowest) but I wouldn't recommend it...I tried that but with virtually no compression travel and hitting those bumpstops, I was encouraged to raise it ASAP!
Edit to add...I will post up a couple of pics to give you an idea.
09 BSM E92 335xi||Black Dakota||Dark Glacier Aluminum Trim
313 Perf. Wheels||LUX H8's