Claimed max power: 1,120bhp
German Porsche tuner 9ff recently made headlines with its GTurbo 1,000bhp 911 conversion. But it previously offered the even more extreme GT9-R using a twin-turbo Porsche 4.0-litre flat-six engine mounted amidships. Claimed to produce 1,120bhp and 774lb ft of torque, it was reputedly capable of 259mph and 0-62mph in 2.9 seconds.
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