Weird sound coming from my Z

When I press the gas there’s a whining noise that sounds like it’s coming from the back, it doesn’t in every gear and most of the times I press the gas, does anyone know what could be causing it? It started yesterday, wasn’t happening before so I’m trying to get ahead of before I end up on the side of the road or something. The car is a manual 2015 370z Nismo with 55k miles