Like the title says, I have a sudden vibration or rattle that comes from the engine compartment when at high rpms (5200 - 6500 atleast (haven't gone past that)). It is not just the engine picking up its revolutions, I think it could be resonance within the begininning of the exhaust but i'm not too sure.

Background info: car is a 2005 G35 Coupe w/ 6mt and only 44,100 KM's. The gas tank has always been full when this happened and no engine lights or anything of that sort came up. Car was just inspected by Infiniti, who said everything was in perfect condition.

Any idea as to what the problem or rattling is coming from? I would like to fix it myself and avoid infiniti slapping me around with high bills. Hopefully its covered under warranty(powertrain), If i cannot troubleshoot this, I will have to bring it in.

I will try to put a video with sound up in the next couple of days to help troubleshoot.

 

Hard to say what might be loose, but the V35 tends to be s shaky beast at higher RPM's, which was something I had to get used to coming from a high-revving Honda engine.