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[elff]

There is a post with 4 Dyno charts from 4 GMPP tuned cars on the same day on the same dyno.
2 cars had Dejon IC Pipes, CAI and Aftermarket Exhaust
2 cars had stock IC pipes and airbox

All 4 cars pulled within 2hp of each other and real close on ft-lbs
Avg at wheel
264.5 hp
323 ft-lbs

Considering the car is rated at 260 hp and 260 ft-lbs at the crank from the factory in stock form
GM's claim for your performance upgrade seems to be dead on with 290 hp at the crank

It also showed that the tune isn't customized for the aftermarket parts and pretty much ignores them.

On the same day, we did see any Automatic have trouble getting an accurate Dyno and their numbers yielded almost identical results to the above post.

Side by Side spirited driving next to that same Automatic showed that it had almost the exact same power, so while I don't know the exact reasons as to why, I fully believe the Dyno was not displaying accurate numbers for the Auto