Review on 🚗 Dorman 674-959 Exhaust Manifold with Integrated Catalytic Converter - Non-CARB Compliant Solution for Improved Vehicle Performance by Mike Mitchell

2006 Nissan Altima SL 2.5 engine. Suitable for replacement, all mounting bolts/holes on the part itself match the engine. The cat on the underside is approximately 1" longer than the OEM, allowing the exhaust/flex pipe to hang slightly lower than before. Also, the holes on the original heat shields didn't line up exactly with the screw holes on the part. A 1/4" drill bit solves this problem. There are two O2 sensor ports on this thing, but there was a male connector for the bottom O2 sensor port already screwed in when I got it. Important as the Altima 06 only has 1. It There are several tutorial videos online.A tip: Spray the bolts with penetrating spray the day before you start.Spray again a few hours before you start work and again just before you start work.A friend gave me some advice and it helped.