Just got a yellow top.. What would be better.. Adding a 2nd yellow top in the trunk or a capacitor? Or both?

Also about to do The Big 3 in 0gauge.. In preparation for an upgrade currently pushing about 900 real watts n moving up to about 2000 real watts at the most.. Going to eventualy get a single Audioque hdc 15" aluminum coil and an AQ2200d mono amp.. Just basicaly looking for options around my alternator nor being able ro be wound/cranked up to a stronger amperage due to mechanics not wanting to touch it cuz its a 02' mazda 626 4cyl so im left wirh trying to beef everything else up.. Please help with any info/suggestions /links to anything else i shuld do or NOT do. Thanx so much in advance!