I used a razor knife to cut the screens at the plastic. Then I used fine sand paper to smooth out the burr's. After I was done I sprayed some electrical cleaner to remove the dust. As stated, be careful of the sensor wires.:thumbsup:
Ive used an exacto knife on several, keep in mind the rear screen is basically there to protect the heated filliment from damage but the front screen does 90% plus of the protection as thats the dirrection of airflow, remove the rear screen and your removeng a small bit of restriction, remove both and your increasing flow slightly more, but your taking a far bigger chance on damaging the filliment with the front screen removed, personally, after testing performance both ways ID suggest leaving the front screen.
MAFs cost about $250 you don,t want to be replacing them frequently and the gains are minimal.
btw cutting the heat fins to further increase air flow sounds like a good idea, BUT ITS NOT! the maf WILL eventually burn out its electroniocs if those are removed as it operates far hotter and heat destroys electronics