Need advice

[avalonasty3627 0]

This is my setup and i need advice to see if i need a capacitor or not.

2001 toyota avalon xl

2 Type r's 1222d

Kicker zx1000

Kenwood double din headunit

This is my first system and the people at the electronics store said that i need a cap but i cannot be sure.

I dont know how to do the big three upgrade.

My question: Do i need a capacitor and if i dont have one will my lights be dim?

and Will the alternator and battery be able to handle the power without sacrificing the dimming of lights and other electrical problems?

i think the alternator gives out 80 amps stock and with the car on it is between 13.5-14.5V

thanks