7.3 litre AMG R129

A V12 Mercedes SL not enough? Don't worry, we've found an AMG R129 with a whopping 7.3 litres.

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Mercedes-Benz AMG SL72, one of just 35 built, is to be auctioned at Bonhams’ Goodwood Festival of Speed sale in June 30th.

Based on a 1995 SL600, AMG bored the V12 engine out to 7.3 litres, which meant that the performance grew to 525bhp and 553lb-ft of torque. That means the SL can surge to 185mph, with 60mph just a memory after 4.6 seconds. It was such a potent package that Horacio Pagani chose it to power his Zonda.

It was also such an appealing package that the Sultan of Brunei ordered 25 of them... in one go! This, however, is one of only 10 sold privately, and is one of very few badged as an SL72.

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It was serviced last year and found to be faultless, and comes with a panoramic glass sunroof – to see if any helicopters can keep up, obviously – and has wonderful 18in alloy wheels.

Up for grabs with Bonhams at its Goodwood Festival of Speed sale on June 30, it’s got an estimate of £70k-£100k. Do you reckon that’s an accurate estimate?