Arp (400-7534) Valve Cover Bolt Kit on 2040-parts.com

Renault DeZir concept (w/ Gallery)

The Renault DeZir concept is the first Renault Design project led by Laurens van den Acker. When it's officially unveiled at the Paris Motor Show in October it will lay a marker down for the brand's future design direction. The 4225mm long two-seat sports coupe embodies Renault's new vision of 'simple', 'sensuous' and 'warm' designs.

Concept Car of the Week: Mazda RX500 (1970)

Developed by the Toyo Kogyo Company's advanced design and engineering team, the Mazda RX-500 was described as a ‘mobile test bed for high-speed safety'. Looking at its design, the team's childlike enthusiasm has shone through, resulting in a very cool concept.  From the rakish front to the wraparound windscreen and on to the bread van rear, everything communicates high-tech and ‘70's futurism while also channeling a little of the Star Wars X-Wing. Thanks to plastic body panels, the concept weighs only 850kg and is powered by a 491cc rotary engine delivering 247bhp fitted behind the cabin, in front of the rear axle.

Acura NSX prototype will drive Mid-Ohio prior to IndyCar race

Acura's new, long-awaited NSX is still two years from arriving in customers' impatient hands, but attend the Izod IndyCar Series race at Mid-Ohio on Aug. 4 and you'll have the opportunity to see and hear the car in action. Acura on Thursday released an image of a prototype NSX, and said the car will take to the racetrack just prior to the Honda Indy 200 in Lexington, Ohio.