I am going to agree with speed. I will say that after laying down dynamat in most of my car I noticed it is a bit more sluggish on pickup but it is much quieter than it was. You can go to the sky and back for getting rid of noise but at the price of weight that is the thing. To me the z is pretty quiet already. After driving in one for 3 days and getting back into mine the z seems very quite.
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