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Depending on the state of the union in which you're living the "Jeep Life," your older Jeep may require a catalytic converter to meet state law standards. 4WD carries California, Universal, Direct Fit and Standard Duty catalytic converters from top name brands including Flowmaster Exhaust, MagnaFlow Exhaust, aFe Power and Omix-ADA. We offer converters that keep you in compliance with minimum negative impact on performance or fuel economy. If you're installing the catalytic converter yourself, check out the 4WD YouTube channel for installation tips from the video How to Install a 4WDH Cat-Back Exhaust on a WJ Grand Cherokee.