We picked up a good amount by adding the headers over the E85 tune with stock manifolds. We added the Kooks 1-7/8" LT's along with their offroad pipe. You can see on our build progression how they helped with added HP/TQ but also lower ET's and higher MPH's at the track.
How did you test this ?
Local shop using a DynoJet. So, after adding long tubes, my rwhp went up from 432 to 452. After adding the PMAS airbox, I gained an additional 18 to 470. Tune wasn't a factor as it was already previously tuned for the E70 and long tubes. Of course, adding the PMAS necessitated a tune update, but the PMAS alone was still worth 18 additional horses, in my case, while still using E70. All of these runs up to the 470 test were done on the same dyno at the same altitude with the car having less than 2000 miles on it. It now has over 12,000, so it's fully broken in and the tune has been refined a little more to get me to 475rwhp last week. Again, same dyno, same altitude. I only did two runs and both were 475. By the way, the long tubes I'm using are the eBay Chinese made Pypes Step-Up clones that are a popular and somewhat divisive topic on Mustang Forums and Facebook sites. I paid $134 shipped free and had the same shop with the dyno install them for $500. They work great and give the car a very deep, powerful and tuned sound. Hope this helps. Good luck...
Your inlet temps go back to about 5-7 degrees above ambient when you start moving. It's when you idle for long periods it jumps up.
Either way, the "gains" are due to the airflow being so open with the hood up and they are gone mostly if not all once the hood is back down. We tested it multiple times and its very repeatable. Thats why you see most of the non-3rd party dynos for intake "gains" with the hoods up.
Right, I get that. Lets say I'm moving though, I would expect to get that same power in the higher RPM's with the airflow through the Velossatech and to the filter.
I understand the confusion. I was a total skeptic too. Of the four mods that I planned (Tune, E70, Headers and Airbox), I chose the PMAS to be last. I was that skeptical. Still, I could afford to experiment, so that's what I did. The PMAS only cost me $267. The first thing that I did to the car, even prior to the baseline pure stock pull of 394, was to smooth out the stock airbox. I removed the little static fumes filter inside and ground down all of the plastic ridges, bosses and casting flash. I also used a K&N high flow filter. 394 was the best I could do with about 800 miles on the car. The motor was still pretty tight.