I had what I think are maf related issues. Occasional weird idle and even stalled a few times. Was directly tied to installation of the intake. However after updating to the latest firmware these issues seem to have disappeared.
--2011 335i xDrive coupe-6MT
--Premium/Sport/Cold Weather/Nav/Comfort Access/Harmon Kardon
--JB4 Stage 2 : BMS intake : Active Autowerke exhaust : ER charge pipe : cdv delete : M Sport shift knob : 12% tint : clear bra