ohhh lord its a pain in the ass, you start off by taking the MAF sensor apart into the 3 pieces that you can seperate it to, take the black piece and put it to the side because you really dont want to mess with it, they are really easy to break, thats why i have few laying around, then you get the 2 aluminum pieces and use a hack saw to cut out as much of the bars going through it as possible, then i used a dremel and grinded it down till the whole thing is round and as smooth as possible, you can leave it at that or you can get a porting tool and port it out a couple more millimeters, then i just used some polishing compound and the polishing rag attachment for my dremel and made her shine, then just put her back together, you can go to my profile and look in my album and see pictures of it and my throttle body, also i dont know how man people know this but you can also remove the piece of honeycombing out of the MAF sensor and it makes it alot less restrictive