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

GM says natural-gas Chevrolet Impala on the way

General Motors said it will sell a version of the Chevrolet Impala sedan with the ability to switch between gasoline and natural gas, part of the automaker's plan for taking advantage of a U.S. drilling boom that has made natural gas a more viable fuel for cars. The dual-fuel Impala, to be announced today by CEO Dan Akerson at a conference here, will have one engine and two fuel tanks -- one for gasoline and one for compressed natural gas.

Snow cars: The AW list of winter warriors

Having the proper gear is important when it gets cold and the snow starts to fall--coats, hats, gloves and cars. With that in mind, AutoWeek offers this list of sure-footed rides for the winter. Some have higher sticker prices--we're looking at you, Range Rover--but most are fun, economical rides that will get you through the deepest doldrums of winter.

Porsche 911 Carrera 4 GTS: Another ‘Final’ 911 arrives

Porsche 911 Carrera 4 GTS - now you can have your GTS with 4WD It’s never been easy to pick a 911 to buy. Despite all 911s looking much the same to all but the Porsche nutter, there’s a choice of at least a hundred different models (well, it feels like it when you try to decide), from the pure 911 Carrera 2 on up to the Turbo Cab and all the bonkers ‘Track’ 911s – the GT this and the RS that. And now, just to confuse things even more – and to extract a few more sales before the 997 version of the 911 joins the list of 911s that once were – we get the Porsche 911 Carrera 4 GTS.