So I am weighing my options about our 2003 Nissan Altima and looking for input. Long story short, the engine seems to be in the early stages of failure. The car only has 75K on it. It is consuming oil, about a quart a month. After some research, these cars are notorious for having the pre-cat fail and get sucked up into the engine. That's probably what happened or is in the process of happening. It's one of those things that you don't start looking into until it's too late. Right now I have a Cylinder 3 misfire code. Already did plugs and threw coils at it. Going to do a compression test tomorrow and most likely it will confirm my fears. So my question is, what are my options? Will the engine fail no matter what I do? Is it too late? Is there any way to do something to save it without tearing it down? Would I be wasting my time if I removed the original header and precat and put a replacement header on there? Thanks!