Soft Rubbing Metal Sound at the Back

[ungazyo182]

Hi!.., I'm have a 2005 vios.., I occasionally hear a soft like rubbing metal sound at the back.., I couldn't find where it's comming from., I've already replace the shock absorber at the back.., I've already check my loads at the compartment including the tools.., The rear seat had already been tighten but there's still this annoying sound.., where could it be coming from?

[CivicVTi]

Check the exhaust system, maybe a rubber connector is cracked and the muffler is making contact with the chassis.

[ghosthunter]

or the metal heat shield has gotten deformed and is rubbing against the muffler or exhaust piping.