"It looks pretty, but I want it to sound better"
High-level inputs on AudioControl's OEM Interface products make it easy to upgrade your factory stereo.  In this example, an EQX takes a factory stereo signal, and gives you 6 outputs of controlled sound.

Customize the Sound, Not the Dashboard
Any 4-channel factory radio can be expanded to a high performance system by running speaker leads into an EQS.  Add a 6XS, and you have complete control over an expanded 2-way system.