focal does make a coaxial 5x7 it runs for about $250. its from the integration line, the ic570. i would suggest looking into it. but if you want a component set you will have to look at something else or modify. i plan to modify my doors because i want to put the best speakers in there, but hey im an installer, so i have to have the best. my vehicles are demo vehicles for our shop.
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as far as dynamat if you want to spend the money, then do the roof, floor, and inner and outer door. about $1500 in materials. make sure to use the xtreme line of dynamat