i have a toyota camry v4, pioneer DEH-P2600 50x4 cd player 2 dual subs together is 1100 watts and a sony amp which is 1200 watts. now my lights dim when i play anything loudly, so i want to know what can i do to help this situation.
No, don't git a capacitor. That will make the problem even worse. Your alternator is already struggling with your system, then if you added a cap, it would have to work even harder to keep the cap charged. After gitting a new alternator, then you can look in to cap's.