Semi-off topic but I thought I'd throw it out there. For maintenance, or to correct MAF deposits from an over oiled (oil based) filter (like what they may use on aftermarket intakes) there is this stuff:
CRC Mass Air Flow Sensor Cleaner:
Quote:
CRC Mass Air Flow Sensor Cleaner is the safe and effective alternative to "underground" methods of MAF sensor cleaning. Don't us aggressive chemicals like brake parts cleaners or carburetor cleaners on MAF sensors. These can cause serious damage to sensitive parts. Use CRC MAF Sensor Cleaner -- It's the right product for the job! It safely and easily cleans the MAF hotwires and electrical components without damage to the wires or plastic housing. Cleaning is simple, safe and fast. The whole job should take less than 10 minutes!
Benefits and Features:
Safely cleans and protects MAF Sensors.
Plastic-safe and leaves no residue.
Increases horsepower.
Decreases hesitation and pinging.
Improves fuel economy and MPG.
Reduces rough idle.
Use every time you clean or change your air filter.
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The guys on the M3 forums who had some higher mileage cars reported noticing a difference after cleaning FWIW. Maybe it's something to consider after you service your filters to avoid possible codes later?? Again just thought I'd throw it out there.