I need to know what kind of amp I need for powering these 2 Rockford Fosgate Punch HE2. im looking to spend around 300 or so and I want to get the most outa them. reccomended RMS is 400w max is 800w. I was told to get a 2 ohm stable mono... all the prices I were seeing were really up there though. also would I need to replace anything in my 4 runner to run a setup like this I already have the battery wire hooked up with 4 guage.