Herbaliser:
Sorry, but for improved accelration you need torque only. HP influence only max speed.
Sorry but this simply isn't true. For 200+ acceleration you only need HP. Torque is almost irrelevant. It shouldn't take much digging to find the physics behind that.
You are thinking about torque around the peak range I think ? torque and hp are interchangeable, hp is just a number derived from torque so what you actually need is high torque high up the rev range, 860NM @ 7000rpm feels very nice on my 7GT2 and of course quoted as hp doesn't make it pull any less
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997 GT2 2014 3.9 Mezger, 800PS @ 1.1 bar