The beefy 4.4-litre twin-turbo V8 has been upgraded to produce 900 horsepower and 1,200 Nm of torque.
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The upgrade pushes power up by 50 hp and torque by 100 Nm.
Further down the line they will likely offer an even more monster package of 800 horsepower and 1,000 Nm of torque.
When it comes to making powerful BMW’s even more powerful, Manhart are right up there.