Hello! I believe I can help you out here. I made my own short ram for about $40 and a little bit of cutting. There is a couple ways to go about it:
1. I went to my local car parts store and found a bunch of spectre universal intake parts, I picked up a cone filter, 6" straight tube, and a 3-2.5" silicone reducer (they only sold 3" pipe). Because our intake is 2.5" you cannot screw the MAF into the 3" pipe. My solution was to cut out the tube in the stock airbox where the MAF sits and put that back on before the throttle body.
2. If you can find 2.5" tubing online you could buy a MAF adapter with the other intake parts I mentioned and not have to chop up the stock airbox. This should also be significantly cheaper then $500.
Ill post some pictures of my set-up when I get back home tonight. Should clear up any questions.