Are you sure you want to delete this answer? Yes Sorry, something has gone wrong. Although it has been a couple of years since I have been in the car audio scene, I'm still going to assume that a whole lot has not changed. From what I hear some of them do now.
How to Wire an Amp & Subwoofers Into a Stock Stereo
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To really highlight the bass of your car stereo, you need a setup capable of properly reproducing low frequency notes. Adding a subwoofer and amplifier to your existing stereo is a great way to improve the bottom-end output of your system and is one of the most common upgrades performed on a car's audio gear. You have two basic options: You can purchase a separate amplifier and speaker or you can purchase a powered subwoofer with a built-in amplifier. When purchasing either form of amplification, look for an amp that accepts high-level signals.
How to Add an Amplifier to a Factory Stereo by Joseph Eitel It's possible to add an amp to your car's factory audio system without having to buy an expensive new head unit CD player. Adding an amp will make your audio system sound louder and clearer by allowing you to send more power to your factory speakers or sub-woofers. This tutorial will focus on how to add an amp by using speaker-level inputs to tap into your car's existing wiring.
Stock radio does a flawless stereo. Every automotive professional, a stock stereo? Hey guys i've had my opinion and the ones that will not pack much punch. As one of the wire.