Nissan Altima catalytic converter

Item fits Altima models with 3.5L V6 engine for 2005 and 2006 with 5 speed automatic transmission. This is the flexpipe and underbody converter unit. ONLY for models that have an o2 sensor on the pipe that curves up to the front (radiator side ) converter unit, see picture. Some models do NOT have an O2 sensor on the converter. Direct fit unit ensures proper fitment and easy exchange with OEM unit. OBDII-configured catalyst technology ensures proper performance, and emissions.