i put a set of jl 5.25 components in the front and a pair of mb quart RCE's in the back of my friends GT.. then powered them with a Kenwood amp.. (forget what size).. it kicks ***.. the sound coming from his car is so clear and smooth.. you couldnt ask for a better setup for his car. If you're willing to put out a few more dollars.. go with a set of Morel Hybrid Ovations for the front.. thats what i have in my truck right now.. you really cannot find a better speaker.. if so, i would already have had it, then replaced it with those Morels.
I used to use Polk's speakers a few years ago.. they're a pretty good speaker.. I liked how they were able to handle bass for your money's worth. Itll be a nice difference once you get somethin other than stock in your Mustang!
2004 Ford F150 FX4
Mods are here and there...