Flowmaster's Federal legal direct fit catalytic converter is for the 1997-2001 Ford Explorer and Mercury Mountaineer with the 4.0L V6 engines. This unit replaces the Right (Passenger ) side only and uses 2.25" mandrel bent stainless steel tubing. Includes all applicable installation hardware. These stainless steel converters meet USEPA standards and include a 25,000 mile emissions, and 50,000 mile/5 year exterior casing warranty. Please note: These USEPA Federal converters are not available for sale or use on vehicles locensed or operated in the state of California.