I have a used Cobb AP for sale, will work on '07-'09 N54 e90.
As you can see in the pic, there are a few scratches on the plastic cover... I'm pretty sure Cobb will fix this if you want to ship it off to them or use to upgrade to the v3.
This one works flawless though and has latest firmware installed.
Will ship for exact cost to me depending on destination. Asking $750 plus shipping costs.
http://cl.ly/image/0r0Z102G3x0F/IMG_3993.JPG