I got one in my 528ia . I have been dealing with ESS for about 2 years now. I live in Thailand so they ship to me direct from norway. I have always had trouble getting the complete kits from them ( 2 kits now) but the kits do work well once installed. I cant figure out if they are disorganised or understaffed. I have spoken to a few people there and they seem to know a lot about BMW's and supercharging. I recommend their product but not their service or delivery. At least their service to Thailand isnt the best but maybe with a US office it will be good there.