Well, I did the same thing on my 00 GT so I thought I would try it on the 03. What a difference! Better throttle response etc. and after a 200 mile drive the intake tube was cool. I am pleased with the results. I made a aluminum bracket to attach the MAF to the engine so the whole system would move. Then I fabricated the shield with aluminum flashing etc. Anyway go to the attached link to view. The site isn't the best, but I am working on it.
http://home.comcast.net/~stangclear/Mustang.html
http://home.comcast.net/~stangclear/Mustang.html