Just out of curiousity, why do you want to do this. And, I have seen many dynos where people have gotten increases from aftermarket MAFs. I am assuming you guys are saying that just putting on an 03 would do nothing, correct?
Well, I have always had fox bodies until recently. I am just looking for ways to bolt on a few extra horses and the foxes always responded well to this. I see the factory '03 cobra MAF's around pretty cheap and thought it might be a cheap bolt on. I have put 4.10 gears in, K & N air filter, and an offroad H pipe, otherwise I am stock. I have read bad things about underdrive pullies causing oil pump failures, so I have ruled that out. Sounds like this may not be the way to go either.