ATP actually says the stock compressor outlet is a restriction, which is why they replaced it on their shop car.
The air intake maybe worth a couple horses, 1-4hp on a stock turbo, but a turbo that is at 13-14psi at 6500rpm vs one that is at 24psi at 6500rpm is pretty different.
Even more... The mass air difference is pretty big between the two turbos.
When your really polishing a turd, 1-4hp + 1-4hp is 2-8hp. The difference between 220whp and 228whp is a nice difference in a fiesta, lol.
As far as the intake, the big deal for me would be spool-up. I'm betting the 2J intake on my specific car would make a 10ft. Of torque difference at least. It could lower my rpm at which X boost is reached. If I can get to 28psi earlier, it could make huge difference. Lol.
On the stock turbo running much lower boost and making 29psi at 2800rpm, that kind of stuff just doesn't change the world, but even on the stock turbo ( that doesn't need help spooling ), joe reported increased response ( on his pro-tuned car ).
What will it do on my car with a cyborg? Time will tell, lol.