Need a replacement catalytic converter for your 2012 Smart Fortwo? MagnaFlow offers high-quality catalytic converters engineered for 2012 Smart Fortwo sub-models and engine sizes. We combine efficient design and state-of-the-art manufacturing to meet or exceed required emissions standards. Select your 2012 Smart Fortwo requirements and state vehicle registration to buy the best Fortwo catalytic converter online that fits your '12 Fortwo and meets your state’s emissions compliance.