Well, with some water/meth in the mix Weistec is able to increase output on 91 octane pump fuel to 708 horsepower and 620 lb-ft of torque at the wheels:
That is at 24 psi of boost. Yes, there is likely more in it but the transmission becomes a question mark at this point.
Also, notice power keeps climbing toward the 7500 rpm redline.
Great power and torque here especially for AMG GT owners stuck with California's 91 octane pump gas who want more power.