I'm very tempted to get my car sound proof too. Too much windnoise and sometimes engine noise if i rev too hard.
Thing is, Dynamat Extreme is really expensive. If not mistaken, Dynamat Extreme may cost up to RM 2000 for the whole car as in doors, boots, carpet, roof. I've checked a cheaper alternative, Raamat and that also cost about RM 1200 for complete car. Not sure about the quality though.
Those who sound proof the car with Dynamat, how much you guys did it?