Kia protects 2006.5 Optima owners in other ways, too. Standard equipment includes dual-stage front airbags, front passenger detection sensors, front side-impact airbags, side-curtain airbags, active front headrests, a tire pressure monitoring system, and front seatbelts with pretensioners and force limiters. Antilock brakes with brake assist, traction control, and stability control are a packaged option for $600, but only on LX V6, EX, and EX V6. If you get the LX four-cylinder, you can’t have these important safety technologies.