Stage 2, was installed on my n55 e92. Its got the mid-August n55 firmware pushed to it now and was running nicely with no issues before I removed it.
It's silly easy to install, but I work a lot and never have time, nor a garage to put it back in. all cables/harness are perfect. I ran this setup for less than a year, and never had any issues with it. Purchased originally from Mike@n54tuning.com
(a stand up guy!). I've got the USB data cable too to include.
If interested make me an offer via pm? Would prefer to sell cable with the JB4 since IMHO you need it.