Hello together, I have to dismantle the “outer skin” in my Golf V because the door lock is defective and in this train I wanted to contain the door panels. Now not much effort, because the org. loudspeakers are also installed. Just an aluminium butyl or bittumen mat on the door. Should already bring a sound improvement…. For example:http://bilder.hifi-forum.de/medium/690447/sl272650a7uf_128555.jpg How much does it take for the two front doors with nem 3 doors? k from the bay or recommendations on what to pay attention to?