Motorcraft Rl-9 Radiator Cap-radiator Cap-safety on 2040-parts.com

Ariel Atom 700 is a turbo-supercharged 700-hp track weapon

If you're willing to ditch sleek supercar looks and just about every automotive creature comfort in the pursuit of pure performance, you might consider the Ariel Atom 3. Powered by a 2.4-liter Honda I4 engine cradled in an exoskeletonlike frame, the Atom 3 boasts a 0-to-60-mph time of just 2.9 seconds But maybe those performance numbers just aren't enough for you. If so, Piedmont, S.C.-based DDMWorks might have a solution.

Concept Car of the Week: BMW Spicup (1969)

The oddly named Spicup, standing for Spider and Coupé, was first presented at the 1969 Geneva Motor Show. Carozzeria Bertone had previous collaborations with BMW such as the 3200CS coupe by Giugiaro. The friendship between Nuccio Bertone and Willhelm Hoffmeister, head of bodywork construction at BMW, must have also contributed to the brand agreeing to provide an early pre-production of the E3 generation 2500 saloon as a base for the concept.

Frankfurt auto show: Mercedes-Benz previews the electric B-class

Mercedes-Benz revealed an electric-powered B-class with range-extending capabilities at the Frankfurt motor show. This rounds out the company's line of standard gasoline- and diesel-engine versions in the second generation of the multipurpose fiver-seater. Set to go on sale in selected markets in 2013, the B-class E-cell Plus is propelled by a 136-hp electric motor that draws electricity from a lithium-ion battery mounted low within the car's MFA platform structure.