Pacesetter Catted Exhaust Manifolds are a great bolt on replacement / upgrade for your vehicle. USA made from stainless steel, these exhaust manifolds include a new high flow catalytic converter and are a direct fit bolt on replacement. You'll be able to bolt this manifold right in place of the factory manifold. Your O2 sensor (if equipped) will also tap right into the new manifold with ease. Whether you're looking to replace a rusted out exhaust manifold or cat, or you're looking to pick up a little extra horsepower, Pacesetter Catted Exhaust Manifolds are a great solution! Pacesetter Catted Exhaust Manifolds are not CARB Approved. They are not legal for highway use in California or New York. You will fail an emissions visual inspection if you use this item in CA or NY and we can NOT ship this item to any California or New York address. The part number for this item is 753006 and it fits 2007-2012 Nissan Altima (2.5 4 Cyl Models).