the major problem is the floor, door and roof panels vibrating creating a resonance drone. That needs to fixed first. It can only be fixed with pasting sound deadener sheets like dynamat as "pukka kaam" - For starters, ensure the carpet underpadding is all in place, specially at the front under the dashboard, next ensure that no rubber plug on the firewall is missing that can allow engine noise to come in, finally ensure that all door vapor barriers are in place - they block wind draft which carries noise.For blocking some noise from the doors, when the barriers are properly in place lightly glue some thin pieces of fabric type underpadding on the door cards - it absorbs the sound energy. Use the same technique on the speaker shelf at the back. And top most check the roof for the same insulation - margalla came with it. It was quite thick too.Check behind the body vents too, if they are stuck open with dirt - you will get noise from there too. You can also pad the bonnet to suppress engine noise. It really helps.All of the above wont work if your doors are out of alignment or the door rubbers are bad - wash them with water, dry them and apply some talcum powder to them so they dont stick to the body when you close the doors.
