Solve the noise problem at the back of my car today. I found out that the metal hitting sound from the boot of the car is caused by a loose metal which connect the handle of the 5th door to the locking mechanism. It is a moving part so I can really tighten it so I have attached polystyrene and some bundled tissues near to the area so that it could dampen the vibrating metal. Will upgrade the 'custom made pad' with proper insulation once I manage to purchase some insulation pads... Stripped 5th door The pad is not even cap ayam- made of polystyrene and tissue papers... but it works! Now the car is almost as silent as new. One more significant noise is from the head unit/ radio. Still assessing whether to change the whole aftermarket unit or to strip 'em down and insulate....lol. It's not cheap to set up ICE... But as for now, I'm quite satisfied with the new NVH. Thumbs down to the Service Centre for not being able to sort this out. I had been to the centre to get it...