I'm installing a aftermarket hu in a 2004 Toyota Tundra. It has the factory JBL system, I have searched around and cannot find a solution to retaining the factory amp without buying the $75 interface, which I dont really want to do. I plan on upgrading the speakers and amp soon but for the mean time Id like to still have a radio lol, any suggestions? I know on the older bose systems all u had to do was make sure you had the cd player remote wired into the amp turn on wire.