This front catalytic converter is designed for Nissan Altima 2.5L L4 models and serves as a direct replacement for OE 674-933. It features a high-flow honeycomb structure with a ceramic carrier to help purify exhaust gases and support smoother engine performance. The T409 stainless steel construction is built to resist heat and rust for long-lasting durability. Its bolt-on, flange-to-flange design and included gaskets help simplify installation. An integrated M18 O2 sensor port supports compatibility with the vehicle's original oxygen sensors.