That really depends on you, some people fully do doors, outer and inner skin, double layer back areas etc...
If you don't want to have too little, get a 4th pack maybe, but i think 3 would be enough, i would definitely spend another $40-50 on the liner for the floor especially towards the front of the vehicle.
Quote:
dangerisFJ previously said:
Thanks JT. So you definitely think 100 sg ft of dynamat is enough to do an entire FJ? What I don't want to do is to teardown the FJ, start doing the dyna-matting and find out that I'm short.  That would suck the big one! 
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