So full and so drunk! This place was amazing drank Bulleit whiskey all night and ate tons of smoked meatsh:

 

I would suggest a 6.5" component set with a high quality aluminum dome tweeter, an efficient 10" sub, and a 4x100 amp to run it all (100x2 for the comps, 200x1 for the sub). Unfortunately, I've been out of the game too long to recommend any gear. My last sub was an Elemental Designs 10o which was SOLID.

 

i'll need a 12" and i wouldn't want to just leave the rear speakers factory...

 

I don't see why you need a 12" so long as whatever sub you buy reaches the lower frequencies. The key is building a properly tuned enclosure that maximizes the potential of your sub. When I do my installs, I like to maintain as much trunk space as possible. My focus install utilized the space where a rubbish factory sub sat (had a custom fiberglass box built) and a false floor where the amps sat. I had tight bass response and could still haul 10 cases of beer.

As for the rear, buy an inexpensive set of coaxs that upgrade the factory speakers.

 

that means another amp, which sucks

new battery, cap, wires, i'll never do it h:

 

You can power the rear fill from the headunit and amp the fronts/sub.

 

eh, that's stupid

 

So is wasting money on improving sound for speakers few people will hear. When I upgrade my front stage, I typically fade it to the front anyway.

 

i'm about to make a thread in the audio, security and automotive lighting section