Kia's new 2001 midsize sedan, set to be unveiled in October at the South Florida Auto Show in Miami, will be called Optima. The new model is scheduled to go on sale in December. Optima, the biggest and most luxurious Kia to reach American soil, will come with either a 2.4-liter, four-cylinder engine or a 2.5-liter V6. The standard four-cylinder engine is expected to produce 149 horsepower, while the optional V6 is expected to produce 170 horsepower.