Need a replacement catalytic converter for your 2009 Mercedes-Benz SLK300? MagnaFlow offers high-quality catalytic converters engineered for 2009 Mercedes-Benz SLK300 sub-models and engine sizes. We combine efficient design and state-of-the-art manufacturing to meet or exceed required emissions standards. Select your 2009 Mercedes-Benz SLK300 requirements and state vehicle registration to buy the best SLK300 catalytic converter online that fits your '09 SLK300 and meets your state’s emissions compliance.