hp (792 kW ) at 6600 rpm and 1,001 ft·lbf (1,357 N·m) at 5800 rpm, with the supercharger at 8 psi and running on 91 octane gasoline. The Ultimate Aero has increased engine displacement of 387 cu in (6.34 L) and increased boost of 14 psi , resulting in 1,046 hp