xtatic or batcap for the trunk would be best route. I ran a Ma Audio 10,000 watt amp that was 4400 rms . 2200 rms to each 12 inch Ma Audio subs @ .5 ohm that was all in a grand prix too in a 3.5 cubic foot box built in 2 separate pieces and screwed together inside the car with the seats out then reinstalled. Port was tuned to 36hz. and ported through where the arm rest folds down for the trunk access. That car had 2 yellow tops in the spare tire well and I got a 180 amp stator and rebuild the alt myself. If you need to you can find higher output guts to rebuild the stock alt. IMO this is the best route to go because the stock case will still be the same and you wont have any fitment issues. Still loudest car ive ever been in hit 137.something on the dash with everything below the window line of the vehicle making it a street class car if I was going to use it in a competition. Long ago when I first got out of HS was the big bass days. Now its make things go fast and ask people to repeat what they just said.......... LMFAO working on bradleys and being overseas a few times doesn't help either!
HUH what did you just say????
Good luck Id up grade the alt and as for only running 2k watts an alt is the best place to start and might not even need a cap. Rule of thumb is 1 farad for every 1k watts so you would need at least a 2 farad cap.
BTW Hifonics is known for making good power but they are neither clean power or efficient amps........