Are the peeps that are getting misfires in cold weather running a piggy? I've had no problems at all down to -40 and a month of -30's. I have a boost guage and notice that the Dinan tune (like stock) lowers boost when it gets colder.
335xi step, back sap; BMW Perfor. Steering wheel, shifter; Dinan CAI, FMIC, OC, Ex; UR cat d pipes; KW v3; Morr VS8; Cobb, PTF e-tune