I'm gonna post some vids in a second.
BTW, the 497 was on 93 octane and 20psi, and he made 745 on race gas and 35psi.
It was tuned by Adam's Automotive in Crestview, FL.
Here's some vids:
This is a dyno pull 539whp on 15psi
TOPENDUSA DYNO test RUNS 1 540HP at 15 PSI - Car Videos on StreetFire

This is the turbo spooling after shutdown
TOPENDUSA DYNO RUNS 3 Turbo SPOOL - Car Videos on StreetFire