Originally Posted by Jeff_in_Oviedo
"Initially the upgrade kit will be available only to automatic F30s who have the pneumatic boost solenoid. You'll add a few wires to the harness and replace the control box with the new JB4 module. We expect to price it the same as the E90 N55 Stage2 upgrade @ $175.".
So there you have it, $175 upgrade from stage 1 to stage 2.
I think they're referring to the N55 Stage 2, and not the one for the N20?
The $175 upgrade is a point of reference so I'd expect an N20 one to cost the same.