GOTHENBURG, Sweden — Volvo has confirmed that its engineering group is working on a 300-horsepower all-wheel-drive C30 'project' car, but the company has no immediate plans to build it.Earlier this year, Volvo North America launched the limited-edition C30 R-Design, priced starting at $26,445 and fitted with a 227-horsepower turbocharged five-cylinder engine.Although Volvo is marketing only 400 copies of the C30 R-Design in the United States this year, Britain's Autocar magazine says the Swedish subsidiary of Ford is planning to build as many as 4,500 of the more potent AWD edition over the next four years, linking the high-performance model to the British Touring Car Championship.Our friends in Sweden, however, while confirming the existence of the 300-hp C30, caution that 'this is a study project with no assumptions about production in any form.' Adds one Volvo insider: 'People have to have fun during this difficult economic period; it might as well be our engineers.'According to Autocar, the super C30 would get a version of the turbocharged 2.5-liter five-cylinder engine that powers the European Ford Focus RS, as well as a Haldex-derived four-wheel-drive system.What this means to you: Even engineers have to have some fun. — Paul Lienert, Correspondent