ATP Graywerks Exhaust Manifold-Converters provide a tested and proven solution to repair vehicles with increased emissions or check engine lights due to catalytic failures. All parts are designed and tested as a direct, exact fit replacement. This includes rigorous application testing to ensure the replacement part meets all demands by the vehicle's On-Board Diagnostic computer. ATP's Manifold-Converters feature high grade steel and precious metals to ensure a long lasting replacement. This is backed by a 5 Year or 50,000 Mile Warranty.