Just for giggles, i hooked up my autoenginuity obd2 gear to the x5 and drove it from work to home last night... i set the monitors to look at intake temp and maf flow rates and outside temp.

BTW, my car is 100% stock with 48K miles.

On average:
Outside temperature was 71 F
MAF flow rate at idle was .75 lbs/min
MAF flow rate at 70mph was 4-6 lbs/min
Intake temp at idle was 80 F
Intake temp at 70mph was 77 F

As you can see, its only 6 degrees difference... wonder how much the AFE/DINAN/etc CAI kits really do... I'm almost certain the only gains is from the different filters that allow more air flow...