Hey guys, I have just acuired this 2009 G37x coupe and have been struggling with a squeak I can't seem to find the source of. I was hoping someone could shed some light on what would be making the squeak. Here are some videos. Any help would be much appreciated
Forgot to mention the only mod on the car are test pipes

 

It's something attached to the engine. Probably the belt tensioner. Could also be the A/C compressor or alternator.

 

The sound doesn't seem to be coming from the engine compartment. It seems more prominent underneath. The exhaust is pretty solid and doesn't move or make any noise when I shake or move it

 

It's cyclical. It's generated when you're parked so it's not suspension-related or trans or driveshaft. Thus, engine compartment.

 

Gonna replace the tensioner and see how that goes hopefully it's the culprit. I just don't get how it's loudest under the car and I can't really hear it looking right at the tensioner itself. It's a new belt as well. Thanks for the replies slarti, hopefully it is the tensioner and it goes away

 

Turns out it's a failed pump in the transmission. Noise got even louder.

 

Boy, was I wrong. Are they suggesting to fix the pump or replace the trans?

 

Gonna hear back from the shop later today. I have a warranty on the power/drive train so wouldn't mind a new transmission haha