Aftermarket Sound: Require Other Vehicle Mods? (Battery, Alternator, etc.)

Am I going to need/should I have a Capacitor with these two amps?...

for the components...90x2 Polk
http://www.crutchfield.com/p_107PA2502/Polk-Audio-PA250-2.html?search=107PA2502&ssi=0&tp=115

for the sub...300x1 Kenwood
http://www.crutchfield.com/p_113KAC8104/Kenwood-KAC-8104D.html?search=KAC-8104D&ssi=0&tp=115

 

You'll be fine.

 

Exactly the thread I was looking for !!

IF I may,

Ive got the Tow package with the 130A alternator, and bigger battery. I am getting an Alpine PDX-M6 (600 @4ohm) and a JL 10w3-4 (i am pretty sure 300rms @4ohm).

Should I go ahead and get the Kinetik HC600 as suggested by my installer ?? It retails for 199, but I found it new for under $100.00 ...

Oh, also putting in a Clarion NZ500 deck.

Thanks for the advice

*EDIT: I often go on camp trips, and use the plug in the bed of the truck to power a couple of things. Or I may run the audio system a little bit. Would getting the Kinetik give me a longer run time with the engine off ?? I can probably safely guess it would for audio system, but what about running stuff off the bed plug ??