Major changes included: The first generation Optima was Kia's first mid-size sedan offered in North America. Available in only two trim levels, including LX and SE (replaced by EX in 2004), the Optima went through a few minor changes throughout its production run. The Optima featured a 149-hp 2.4-liter four-cylinder and a 170-hp 2.5-liter V6 as its two engine choices. For 2002, the displacement of the V6 was upped to 2.6 liters, raising horsepower to a more respectable 185. Standard features for the Optima included air conditioning, power windows and power door locks.