Just given this task to my denter today as the engine was to be pulled out of the car for some maintenance...
1) Rs:1000/- sheet to be installed behind the engine (chasis place side, entire), Function is to prevent internal car from engine heat and Sound, there are the hell of qualities in this particular sheet, go for the one having steel wires inside it, real dense and stiff material.
2) Rs: 1000/- sheet to be installed internal side of bonut.
3) New sheet of Rs: 1300/- (expensive because of Unavailability) to be installed at back end of Dash board.
4) Rs: 400/- per sheet to be installed in each doors, act as sound proving material.
My denter was also talking about some "Masala" to be pasted at the floor of the car form range 3000-6000 but i didn't go for it.