1. Get a HO alternator and a few batterys and get a sundown 1500 and run it at .5
2. Get a kicker zx1500, RF T1500cp, JBL GTO1400 and run 2ohms if you can power it. But its only gooing to be a small improvement. The RF would be the best option
3. Get a Alpine MRP-M2000 and run 2ohm if you can power it