I had a hunch about the intercooler. It was mentioned in the past. Guy I knew had one made a while back. 3.4 whipple setup. Didnt gain anything. My tuner said he spent a decent coin on it and no improvements. Not sure what the flow rate was.
Just because he had one made does not mean it flowed better. A custom one could flow worse if not made right. Also our lower intake may not allow more air flow even with the improved intercooler. Also depends on boost and many other things. The GT500 guys have gains from cooler temps and more air flow going to the Ford racing one or the Kenne Bell one.