Strange noise behind dash, maybe engine/tran related?

ratseal2

Hey guys, '15 Nismo 6MT with 42k miles. Just bought the car at 39k miles so has all dealer changed fluids and maint etc.

I just recently noticed when doing a hard pull after about 6k or higher RPM's, there's a metallic ringing/ sort of rattle coming from what sounds like behind the dash, or possible below it or behind the steering column etc, I am not able to exactly pinpoint it. It's a very similar sound to rubbing two quarters together. It only makes the noise when actually accelerating, as I can keep the rpm's high and it doesn't make the noise, or I can go all the way to redline and let it wind down and it doesn't make the noise either, only under the actual pull raising rpms.

I also can only hear the noise with windows up, and no radio on. If windows are down or any other noise going I can't hear it.

My question/concern, is there a possibility to hear any transmission or clutch bearing noises through the car like this? Could this be the result of the tranny fluid needing to be changed to redline instead of oem? Or is this just most likely some kind of stupid rattle behind the dash to make me worry for no reason?

I did about 30-40 pulls from a stop to redline (RIP future clutch life) in 2nd-3rd gear and it did it every single time at almost the same intervals, however in doing so kinda reassured me it's not something immediately serious otherwise something wouldn't surely broke after that many times right?

Edit- I checked for any loose change, loose objects, glovebox, etc. Nothing changed anything. I had a 2014 6MT touring that never made this noise also. My only mods is exhaust and CAI.