Need a replacement catalytic converter for your 2005 Kia Optima? MagnaFlow offers high-quality catalytic converters engineered for 2005 Kia Optima sub-models and engine sizes. We combine efficient design and state-of-the-art manufacturing to meet or exceed required emissions standards. Select your 2005 Kia Optima requirements and state vehicle registration to buy the best Optima catalytic converter online that fits your '05 Optima and meets your state’s emissions compliance.