It is very vague.
I'm basing my interest on an Aussie Pirelli owner who went for the k04 intake, hpfp and specific giac tune and has said it was a phenomenal leap in the mid range grunt. I don't know what his baseline was (eg stock or stage 1), so take it with a grain of salt...
Other discussions on vortex and golfmkv have been regarding maf issues specifically on aftermarket intakes. Where one software/hardware tuner saying they stick to the stock sizing with their intake to not confuse the sensor, and that all intake manufacturers should follow their example if they want to work with their software...
but here you have two separate companies working together on hardware and software with decent (if vague) results.
Robern, do you know if that was with the k04 specific intake and map? I believe they are both pretty new.
It's not the same diameter as a normal intake, and presumably not the normal tune.
Don't take my comments as an endorsement.
I'm just a bit bogged down reading as much as I can about intakes before taking the plunge myself.