Lexus unveiled the IS-F high-performance luxury sedan and the LF-A sports-car concept at a press conference today at the 2007 North American International Auto Show (NAIAS) in Detroit. The all-new 2008 IS-F high-performance luxury sedan will deliver more than 400 horsepower from a 5.0-liter V8 engine when it goes into production. The LF-A supercar concept is equipped with a V10 engine that produces more than 500 horsepower. Together, the two exciting new cars make a dramatic...