The ultimate in outlandish motoring. Mercedes’ twin-turbocharged version of their massive SUV – the 520bhp ML63 AMG. This 4×4 has near supercar levels of performance, but can the 2.5-tonne beast keep up with our benchmark of mega SUVs, the Porsche Cayenne Turbo? We test them both on the track to find out. Taken from Series 22 of Fifth Gear, first broadcast in 2013.
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