Heard and Read on Site that Sound dampening helps in reducing the cabin noise and also reduces any creeks and sound from doors ..I asked a guy in Lahore and they are asking for 1500 per sheet per door for the sound dampening of 1 door .. and they said that it takes 2 sheets per door .. that totals to about 12 K for the whole car ..Does it really works .. Expert Opnion Needed in this case .. Any one gone through with it ?