Yesterday I switched off the FM radio, heard some knocking sound from the right side. It was low but frequent. It ended with a vibration and gave the feeling as it was from the silencer. The car had earlier touched a high speed breaker prior to it. Some bangs are heard when pebbles detaching from the tires, due to centrifugal force, strike the metal body. On bumpy road with jerks I also heard the shaking sound from the fuel tank. The noise from the fuel pump was also more than normal. Some times over a speed breaker sound comes from the back that may due to rattling of the tool kit. The thin hollow Metal body with extra large size, magnifies the sound effects. The cabin gives the bath room effect to the sound.
These are the complaints many owners have shared. When music is on these all subside and make you feel a proud owner of a perfect noise free car.
After all it is a Suzuki product and quality issues would be there.
Still It is much better car, tip is, keep the music on always, for piece of mind.