Think the point of it Dan is to show what they can achieve with a full weight car, that the performance is coming from the mods and not from gutting it, Imagine if that was put on an Andy F diet and weighed in at around only 850-900kg what times it would put in.
In fairness, how far tuning has come and progressed is usually tightly related to the population of a country, and with that in mind the U.S would be fairly far ahead, if you look at Uk, on sites like 22b.com, 500/600bhp are nearly the trend where here in Ireland 400bhp is the most sought after and achieved, with the odd person venturing higher.
I would say that its probably fairly accurate that is the Quickest road Subaru in the world.. Didnt Andy F hold that title for a while???