This Direct-Fit Catalytic Converter Set is designed for 2010-2012 Mercedes-Benz GLK350. It is a high-quality replacement for your vehicle's exhaust system, ensuring that your car runs smoothly and efficiently. The set includes four pieces of catalytic converters, made of stainless steel and ceramic substrate material, with OE specifications for performance and customization. The item will be shipped in four pieces, and it is compatible with interchange part numbers 25177-AE, 21-439, and 21-440. The set is made in Canada, and it is certified by EPA. Upgrade your vehicle's exhaust system with this Direct-Fit Catalytic Converter Set, perfect for Mercedes-Benz GLK350.