Earlier this year we shared a BMW F22 built by MGarage Motorsport for Polish drifter Marcin Gałat Batman. The coupe’s powertrain consists of a twin-turbo LSX376-B15 V8 mated to a BMW ZF GS6-53DZ six-speed manual transmission using a PMC Motorsports adapter and Winters quick-change rear end. Recently the F22 visited Turbo Lamik’s dyno where the twin-turbo motor made 850 horsepower and 1100 Nm (811 lb-ft) of torque on 98 octane fuel. An issue did not allow for testing on E85 fuel. Two months later the F22 was back on the dyno and made 1032 horsepower and 1267 Nm (934 lb-ft) of torque on E85 fuel.
Update 11-19-2021: Added E85 dyno results
Source: MGarage Motorsport FB page and Marcin Gałat Batman FB page via Piotr