Here is my problem. I have a 3000 watt Diesel Audio Monoblock Amplifier hooked up to 2 15inch Rockford Fosgate P3 subwoofers. I also have hooked up is a Boss Digital 2-Farad Capacitor and a Rockford Fosgate 1-farad capacitor. I am running 4 gauge wiring on everything. Also my system is hooked up to 2 ohms. Now even with 2 capacitors i can see when i hit my bass pretty hard that the battery gauge still goes crazy and sometimes goes at about 9 instead of 14 or 15... Does anyone know whats going on? Thank you for your answers!! 
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also what kind of alternator upgrade will i need? Like is there a special kind of alternator i will need? Or how about if i just bought a secondary battery and put the whole system on it would that help?
Second battery will make it worse with a stock alternator.
Capacitors are useless--- ditch them. They sap a tiny bit of voltage, themselves too. High output alternator is due.
Also, upgrade the big three, this should have been done like yesterday. And it will lessen the voltage dips.
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