Hey guys been a while since I've posted here, so if this isn't in the right place please feel free to move it.

There is a aggrivating metallic rattling noise coming from the engine bay of my 350z, I have an aftermarket Injen shortram intake that came with the car when I bought it used, the sound seems to be coming directly under the intake itself. Since the intake is not oem the dealer won't touch it, and I'm fed up with this noise, sometimes it happens at idle, but is most heard around 2k rpms, and then sometimes at 4k rpms. It is driving me insane!!! Please give me some help guys!