Can't recall a time in recent memory seeing a Lexus product tuned so effortlessly before it was even released. 422hp/513lb-ft of torque at the wheels is pretty wild. However, it was done on 98 octane gas so I'd like to see results on 93.
Stock 362hp at the wheels is a little better than 12% drivetrain loss from 409hp, which is very impressive for a full time 4x4 vehicle. AWD/4x4 vehicles usually see closer to 15-18% drivetrain loss, so it's possible the TTV6 is a bit underrated -- however, it doesn't state if the stock run was on 98 octane also. If so, that could be the answer.