Arias Pistons 12.5:1 Compression 82mm Bore Honda B-series on 2040-parts.com

Video: The Porsche Panamera Sport Turismo concept build process

Porsche has released a video featuring Style Director Michael Mauer charting the design process of the Panamera Sport Turismo concept. The 10-minute YouTube video, which also features General Manager Advanced Design Style Mitja Rorkert, follows the build process through each modeling phase right up until the presentation of the show car at this year's Paris motor show. "It always presents a special challenge when we develop a new kind of car for the Porsche brand," says Mauer, "precisely because we haven't been in the segment before, and the question of whether it matches the Porsche brand always looms in the background." We were impressed at the Panamera Sport Turismo concept's unveiling, particularly with its stance and detail execution, so the video is a chance to see just how this concept came into being.

LA Motor Show: Ford Edge spin-off headed for Europe

FORD HAS given European audiences an unusual teaser by revealing its new Edge large SUV at the Los Angeles Auto Show, before adding that it will come to Europe - with as-yet unconfirmed changes. The car is officially only a concept, as evidenced by the wild interior design. The exterior, however, has been tipped by Ford insiders to be more or less production-ready for North America.

BMW reveals ferocious new M3 and M4

IF YOU’RE no fan of Top Gear-style wheel-spinning, tyre-smoking oversteer, then it’s probably best to look away now, because BMW has unveiled the new M3 and M4. Essentially the same car underneath, the main differences come in the number of doors and the suspension settings, with the M3 built as a four-door, slightly more forgiving saloon and the M4 as a harder-edged two-door coupe. But both will go very sideways, if that’s the sort of thing that revs your engine, thanks to a shared 425bhp six-cylinder engine that sends all that juicy power to the rear wheels.