How much bass you want? Behind seat, underseat, remove seat, blow through? Wanna upgrade electrical to accommodate big power? Rest is easy, sound deaden doors, floors, backwall, replace mids and highs throw in a 4channel amp, possibly DSP. Zen Module makes it easy. Wanna stay within your electrical and go budget yet 10 times better? Get a Fox Acoustic enclosure for two 10's and two 500rms subs. Get a four channel amp and a mono amp for the subs from Down 4 Sound, replace mids with Hertz, Focal, JL Audio C3 or above. Million routes you can go and everyone here will send you in a different direction and none of them will be wrong. Just different budgets, tastes and people will typical represent what they have or have had.