like i said in my first post, I'm sure it's used on alot of vehicles, however, the only one i can confirm for sure is the 2000 celica gt-s seeing how my friend has one and we compared the numbers, and they are the same, also I have been told by another friend of mine his 06 or w/e corolla xrs uses the same one, I have not compared numbers to confirm.
It is not uncommon for a company to use the same part such as a maf, on multiple vehicles in their line.
as for making your own type of intake I'm sure it works great, however, I go to shows around the area and I love the look of my injen cai under the hood.