Tried to install 6 mm to the door panel. Stuck because can not fit in the door. Will try again later.
But i did bitumen on the inside of the door, cleaning the inside area with thinner and paper towel. I put 5 strips with three layers. Door sound now very solid.
I forgot to comment on the result which the roof, under carpet and boot. The interior is very quite now, less motobike sound.
BTW i am in IPOH. Thanks Ninja for the advice.
PS: Can you show us how to doo the door panel and where the material needs to be trimmed to prevent PVC panel form being stuck.