2003 extra cab manual 4x4
Searched for equalizer install w/no results? Looking for recommendation to install 7 or more band equalizer. Already has had all speakers replaced-including door tweets. Currently has premiun factory system w/ amp(factory). Loud enough, just not the sound I am looking for. Want more upper midrange selectability(tuning). Go w/ 2 or 4channel-what wiring harness will be needed. equalizer/booster recommend?