Issue with my Z
 

The passenger seat makes the strangest noises when doing spirited driving. It seems to only happen when there is someone sitting in it, so I drove around with 100 lb. weight in the seat today and wasn't able to replicate the same noises. Any help would be appreciated.

What sort of noises? In both mine and my roommate's Zs if the passenger seats are all the way back they will rub against other interior parts and you can hear that. Easy solution is to not have the seats all the way back.

The passengers intestinal fortitude?

Driver seat in mine makes noises when I'm driving. Seems to be making noise when I move side to side or take a hard corner. It JUST started and it's rather annoying lol.

The plastic thing that holds my driver's side seatbelt squeaks sometimes. Maybe that is what you are hearing on the other side when you have a passenger?

Maybe just the passenger's intestines...

Or don't give your friends rides after a pit stop at Taco Bell?

Tried this today and the noise is gone! ty