[dfarres]

ok, just my 2 cents

Changing the guage with help with power transfer to the amp but ur alternator can never supply the power quick enough so this is the reason u need a cap.

The cap stores and releases power faster than anything in ur cars system can. It works like an additional battery only charging and delivering in milliseconds, unlike the battery under ur hood.

Also keeping the cap close to the amp it reduces the distance the power has to travel. That's why when running the wire from the engine compartment to the rear u'll need a larger guage wire to help with the resistance.