this has been mentioned in the video as well as in this thread... but i thought i'd draw a picture for those ppl who don't know what to do... or anyone not understanding how this works...
like mentioned b4 this forum or members can not be held responsible for something not done correctly... also to remember that this sensor is very sensitive and must be treated with precise care when shaving the fins to be EXACTLY the same...
this is looking from the side with x-ray glasses... the red part is the MAF sensor and the black thingyz are the fins... and of course the air flow past the sensor...
the reason for shaving this part is to direct air away from the MAF and tricking it to think it has less air resulting in a leaner (still safe) burn...
