When the engine is on, every cylinder generates exhaust gases, and exhaust manifold gather these gases into one pipe. Generally speaking, exhaust manifold is made of simple cast iron or stainless steel units. Here are some advisable hints showing your exhaust manifold is failing: you hear a loud noise from engine when you are driving; the performance of your engine is not as good as it used to be; Check Engine Light (CEL) is on; a smell coming from the engine compartment. For you and your family safety, if the exhaust gases do not exit through the right way, it can be a fire hazard melting. It is a task for you to check the situation of exhaust manifold. If it is failing now, do not hesitate to get a new one. And you don't need to go too far away since you are already here. We provide sincerely dedicated service with Nissan OEM exhaust manifold with a surprising cheap price.