Already got one of those too.
He basically said that the competition ones would be ideal for "competition" use. They would be overkill on a road car running standard turbos etc... He did say that these would cater for any future modifications to the car (larger turbos, much higher boost, etc...) I know that this part of the system on the car will never pose a restriction no matter what sort of upgrades I intend to do in the future - a main reason why I went all out, knowing I would never have to touch it again.
All I can say is that without changing anything else on the engine, the car has been transformed. I am still getting use to how differently it drives. This product must be good as although I have not tested it on the dyno I can feel a definite difference almost right through the rev range. I don't hear many other people rave about the extra power or grunt they get from there car just by changing their dump and front pipes - in my case, I am super happy!
I will soon know when I get it on the dyno for a retune and boost upgrade. I'm sure the area under the curve is going to be fat!