2010 Devon GTX shown at Pebble Beach concours

The 2010 Devon GTX, a 650-hp supercar from California design house Devon Motorworks, was shown Saturday at the Pebble Beach Concours d'Elegance.

The speed demon will cost $500,000 and go on sale in the first quarter of next year. Just 36 cars will be produced per year by the company. The GTX is Devon's first product.

Power comes from an 8.4-liter V10 that makes peak horsepower at 6100 rpm. It's one of the most powerful naturally aspirated engines ever, and it's paired with a six-speed manual transmission.

A racing package adds $25,000 to the sticker.

The body is aircraft-caliber carbon-fiber. The interior also uses the material to reinforce the racing seats, and also features leather and chrome fittings. Daniel Paulin was the designer.

It was tested at Willow Springs Raceway and Laguna Seca. Former 24 Hours of Le Mans winner Justin Bell was among those who participated in the car's validation.

"It was not a specific goal to set track records at that stage of validation, but the car outperformed even our aggressive goals," Bell said in a statement. "We are looking forward to additional testing, where I'm certain the GTX will eclipse any time we've set to date."

By Greg Migliore