In the USA it is possible to get a supercharger to fit the 4.8L engine, it sits in the "V" between the cylinders and doesn't raise the engine height.
The result... an extra 100 bhp and about the same ftl lbs torque, with peak torque available 1000 rpmm lower.
The standard 4.8L in Tarka offers:
270 kW (367 hp) @ 6300
490 N·m (361 lb·ft) @ 3400
Red line: 6500
The idea of 460 odd ft lbs at 2400 rpm is simply frightening!
Mind you, these are BMW's figures. Tarka seems to have MMC's "Sports" exhaust, so I've no real idea what power it is tuned to.
"Enough" springs to mind....