So I searched around for the answer and got some help, but not quite what I needed, so I figured I would ask you smart folks.
I'm trying to figure out what size MAF is on my car. Sounds weird, right? Well, I need to know for a tune. The PO didn't give me a run-down of what all he had done to the car when I bought it, and I didn't really think to ask. Come to find out, there was quite a bit already done to the car, so I have no idea about the MAF. It did have a screen on it after the MAF where it goes to the filter, I had to take that out and just put in a gasket. The screen didn't fit in the correctly and didn't seem to seal too well.
I did read somewhere that the stock MAF is 80mm, which converts to 3.15in and 90mm would convert to 3.54in. but that didn't say OD, ID and which side and well, I'm a bit of a noob when it comes to MAFs. I do think it might be stock, though.
So enough of the rambling, here's some pics and hopefully someone can give me an idea...
EDIT: After all that, I believe I answered my own question.. The MAF I have has the metal that lines the holes where the bolts go. In the pictures on AM, the 90mm lightning does not have any metal in the holes, So I do believe mine is stock.