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I wanted to ask, is that top of the engine that you painted from red to black with 2 red nuts, thats the top of engine correct with factory plastic cover off? Mines the same, but black. I bought my 350z a month ago and its a 04. I just wanted to make sure if it was like a upgraded intake manifold or stock, though like yours it also has a short ram from Jimmy Wolf that you seemed to also had have how are you liking that injen intake compared to Jimmy wolf Thanks!
The technical name for what you are referring to is the upper intake plenum.
Mine is an aftermarket made by crawford. Yours is probably a non oem unit if its black, I think the stock unit is silver. But hey it's been so long since I've seen a oem plenum I could be wrong.