Arnott Air Suspension P-2676 Air Suspension Compressor Fits 07-11 A6 Quattro on 2040-parts.com

Watch Tesla Model S testing new titanium armor

In a missive signed by Elon Musk himself, Tesla announced it would be adding titanium plates and aluminum deflectors to all new Model S sedans and offering free retrofits for the 20,000 or so existing EVs. The company earlier offered an over-the-air software update to raise the ground clearance of the Model S so the car would be more likely to clear dangerous road debris. The actions were in response to well-publicized fires in the electric luxury sedans.

More Power! Get the details on the potent Porsche 911 GT3 RS 4.0

Porsche has ramped up the already heady performance of the 911 GT3 RS through the adoption of a new, naturally aspirated 4.0-liter version of the company's sturdy, horizontally opposed flat six-cylinder engine. The unit kicks out 50 hp more than the 3.8-liter six-cylinder used in the existing 911 GT3 RS. This mill claims 500 hp at 8,250 rpm, a figure which makes the speedster the most powerful naturally aspirated road-going version of the 911 ever.

GM announces pricing for 2014 pickups

The redesigned 2014 Chevrolet Silverado and GMC Sierra pickups go on sale this spring with V8 engines that General Motors claims will get slightly better fuel economy than the rival Ford F-150 equipped with a turbocharged V6. Chevrolet is holding the base sticker price on the 2014 Silverados to the same as that of the 2013 models. This means a rear-drive 2014 Silverado with the base V6 engine will sticker at $24,585, although that model won't be in dealerships until this summer.