I recently installed a new HKS exhaust on my type-s 03.

very satisfied with this setup however just started hearing a vibration tinny noise from underneath midways down.

checked all connections and they are tight.

seem to only hear it when at low rpm...and backing up...

could the pipe be hitting the heat shield...

please help....

 

could be hitting the body somewhere. but does it stop at high rpms? and recheck your hangers.