I wonder if that engine even has much done, or if it is relatively standard.

Certainly a nice smooth and very wide powerband, probably capable of more at lower rpm's than they're actually using there.

Nearly 1000hp at only 5000rpm or so aint bad, and then all the way to 9000rpm ! And still not really falling off much

Downpipes off the turbo don't even look huge for the numbers, must only be 3.5" ? Certainly don't look 4".