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First of all, lot of that low end difference between the car with the 530's vs the car with the stock turbos and Full IC piping is probably attributable to the fact that the car with 530's has 400+cams, and depending on how the car was tuned it could be tuned to be making more top end at the sacrifice of slower spool up, and therefore low end power. I know for a fact that my car, with stock cams, stock intercooler/inlet piping with greddy's spools up faster and has a better low end then Trihn's car. We both have the same injector's, downpipes, manifolds, exhaust setup and turbos. I build boost faster than him because i have stock cams and his car is tuned with 400 cams, despite the fact that he has full 2.5" piping and i do not. (that's just to point out there are more variables than piping diameter that effect spoolup characteristics, which translate to low end power on our cars) Second of all, what boost levels are those runs at? Judging from the high 400's on stock turbos he's got to be pushing at least 18psi on stock turbos, which is all good for a dyno pull, but 18+psi on stock turbos day in day out, and they wont last long, whereas that is really no big deal for 530bb turbos, since they run 18psi very efficiently. All things being equal, the stock turbo car, with stock cams and full 2.5" piping will probably make about 50 more horsepower on the low end than the same car with 530bb turbos on stock cams. However the stock turbo car will likely turn his boost down in order to keep things safe for the stock turbos, whereas a car with 530's can step off the dyno and go run those boost levels day in day out. 
Its quite obvious that any setup benefits greatly from the full 2.5" piping and massive intercoolers, and that only becomes more and more evident as you run larger turbos. so the question is, if you've got 2k to spend and you've got stock turbos on your car, what do you do?
It's not like the 530's are slow spooling turbos, especially coupled with 3" downpipes and MSP manifolds, so it's not like you'll be sitting there with your foot to the floor in lag city because you've got stock piping. So, if you want to actually make high 400's on the street not beat your turbos into the ground, spend your money on ball bearing turbos. If you want to say you've got as much power and a better low end than a car with ball bearing turbos for a dyno pull then by all means spend the money on piping, turn the boost up to 20psi, and enjoy having smoking turbos, then pull your motor a few thousand miles later and install the ball bearing turbos you should have gotten in the first place. However that might happen sooner than you expect, in which case new turbos might not be in the budget, so you can find another set of used stock turbos, throw em on, and then do the same thing the next year. or you can just turn the boost down and not actually be making the power that your dynochart indicates, but where is the fun in that? All i'm saying is you can show me all the charts in the world of stock turbo's with IC piping vs 530's without it. at the end of the day a car with 530's will make mid to high 400's on pump gas reliably, and the spoolup is still great. The car with stock turbos and the 2.5" piping will not make high 400's on 93 octane reliably, so who cares what the dyno chart says? if you want a reliable, high 400's car with great spoolup, you get that with 530bb turbos. Dyno charts don't tell the entire story. We're talking about very similar numbers on a dyno with drastically different ramifications in the real world.
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That's not an apples to apples comparison - 
