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

Listen: Upcoming Ford Focus ST to employ sound symposer

While BMW employs a digitally sanitized/perfected sound file to give M5 owners the proper sense of aggro urgency when motoring at pace, Porsche went a little more organic with its employment of a sound symposer to feed the 911's flat-six growl into the cabin of the extra-refined 991. Essentially, the sound symposer is an electrically controlled diaphragm in a tuned sound tube that brings the proper engine noises into the passenger compartment. It can be opened and closed by the car's onboard electronics to offer snarl when you want it and serenity when you don't.

Aston Martin V8 Vantage N420 Roadster arrives

Aston Martin Vantage N420 Roadster It was back in June that Aston Martin announced the Aston Martin V8 Vantage N420, which is the 4.7 Vantage version of the N400, but this time – as the 4.7 Vantage is quite brisk without fiddling – the Vantage N420 has to make do with the regular model’s 420bhp. When we got the original detail on the Vantage N420 we only got photos of the N420 Coupe, even though Aston Martin made it clear that there would be a roadster too. And here it is in all its glorious Aston Martin Convertible carporn-ness.

Fisker to buy former GM Solstice/Sky plant in Delaware for $18 million

The old General Motors plant in Delaware that until July cranked out sports cars for Pontiac, Saturn and Opel will be sold and retooled to build plug-in hybrids with UAW workers. Fisker Automotive said Tuesday that it will buy the plant, located in Wilmington, Del., from Motors Liquidation Co.--the old General Motors Corp.--for $18 million. If Fisker's plans come to fruition, production at the plant could start in late 2012.