Had to check the car again, I could hear more noise. Found out the passenger side muffler is in direct contact with this shield thing which I don't know what it is. I don't think I can remove that either. Any suggestions? For now I placed a piece of rubber in between which eliminated the noise but the tip on the passenger side is now hanging slightly lower than driver side's
edit: nevermind, just found my answer... that seems like it's the fuel line cover and it can be removed