It plugs into the TMAP sensor just underneath the airbox. Very easy to reach on the Z4. I think there are instructions on
www.burgertuning.com. No dyno runs. There is a dyno chart for the JB+ installed on a 335 with 93 octane on Terry's site as well. IIRC, it makes about 40hp and 50 lb/ft. of torque, very noticeable difference in power.