i have 04 silverado with factory head unit for now , 4 10 inch pioneer premier shallow mount 4 ohm subs in sealed box , kicker kx600.1 on 2 wired in 2 ohm load and jl 500/1 on other 2 wired in 2 ohm load. also have optima red top under hood and kinetik hc600 under hood wired through a 90amp...