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.

Toyota to roll out rear-seat airbag

Toyota Motor Corp. has developed a rear-seat airbag that deploys between passengers and will install it on a model to be launched in Japan. The airbag inflates from a fixed, rear-seat center console during side collisions.

Forget high beams -- lasers are coming

Audi has kicked off 2014 with the unveiling of an updated version of its Sport quattro concept car -- as first revealed at last year's Frankfurt motor show. Set to underpin the German carmaker's stand at the upcoming Consumer Electronics Show in Las Vegas, the latest incarnation of the bullish-looking two-door coupe showcases distinctively styled matrix LED headlamps with new laser light technology that, Audi officials suggest, will soon begin appearing on regular production models as a high-cost option. Already confirmed for the Audi R18 that will compete at the Le Mans 24-hour race later this year, the new headlamps use matrix LEDs and an aperture mask for low-beam mode.