You can always trust an exhaust component made by Kooks, and their catalytic converters are no different. The sole converter we carry on our site is designed for universal fitment and is legal for application on both gas and diesel vehicles in 49 states – omitting California, which has adopted its own set of emissions regulations. Quality-crafted and designed to improve power while reducing the negative effects of noxious fumes, Kooks catalytic converters are backed by an unparalleled 1-Year, Lower Price Guarantee.