i dont do the installs myself im more of a computer builder, but i know my car has a 120 amp alt and a deep cycle optima yellowtop battery, my installer is Audio Experts in Ventura California Link for AE , dustin the guy who set me up with all my stuff (like 1/2 price too) said he built the ported box directally from Rockford reference designs, and since i am a Frys Electronics employee im going to get a buttload of Dynamatt for a discount. right now i have a legacy La1990 (it says 2000 watts but its really like 200)