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Hennessey Cadillac Escalade gets 557 hp

The 2015 Cadillac Escalade is about as American as an SUV can be. We didn't find the 420-hp, 6.2-liter V8 lacking in any way, but if you want something with a little more grunt, Hennessey Performance Engineering and its HPE550 upgrade should help. Hennessey says the HPE550 Escalade package bumps output to 557 hp and 542 lb-ft of torque with the help of a belt-driven supercharger producing 6 psi.

Festival of Speed: onboard with David Coulthard up the Goodwood hill

If you’re able to arrive early enough on Thursday for Goodwood’s Moving Motor Show you might just be able to book yourself a slot to drive up the famous hillclimb course with one of the many manufacturers displaying their cars. Few mere mortals get the opportunity to drive up the hallowed tarmac at Goodwood – it’s more often reserved for F1 aces and motorsport heroes, such as a certain David Coulthard. In this video from Mercedes-Benz, DC takes us on a guided tour up the hillclimb, corner by corner behind the wheel of a suitably glam Merc SLS Black Series.

Ariel Atom 3.5 (2012) first official pictures

It's difficult for Ariel to come up with a mid-life refresh for its cars - there simply aren't that many bits to fiddle with in the first place. Still, the boys from Somerset must have succeeded, because what we have here is the freshly updated Ariel Atom 3.5. As the name suggests, it's a development of the Ariel Atom 3, with a crop of minor visual  tweaks and some mechanical changes too, keeping Caterham and BAC looking over their shoulders.