When the 2013 Acura RDX launches this spring, Honda will quietly close down a spur line of its Anna, OH, plant. Since 2006, it had been building the 2.3-liter four-cylinder engine used in the first-generation RDX there. These engines were unique, the company’s first to be fitted with a turbocharger from the factory. But the redesigned 2013 RDX will be available only with a V6, and with no other application for the turbo four, Honda’s most impressive performance engine will die an ignoble death. Funk Flex