look at my gallery and yes i put down plenty of deadener there is a thread on deadener in the coupe section. you do not have to buy dynamat since you are paying for the name look at
www.raamaudio.com
www.secondskinaudio.com
1 roll around 60sqft of raam mat is plenty to do the trunk, doors, hatch, and wall where the stock subs are.
any time you do audio you want to do the basic big three electrical upgrade
1/0 gauge power wire from alt + to batt +
1/0 gauge ground from batt to chassis
1/0 gauge ground from batt to engine block.
then add a mini battery in the rear like the ones i posted the kinetik 800 is an awesome battery and easy to tuck away in the car once you make an amp rack.
jl 12w7 will sound awesome around 750-1000 watts, you can run it on 500 and it will pound but can distort at higher volumes where the 1000 watts is plenty of head room