Hey, I've got the same thing going on with my S4. You can do it youself. most aftermarket stereo shops, car toys, etc will do it. They'll also tell you not to do it yourself. But, I did. If you're audio and electrically inclined at all. It's not too hard. It uses a product called an OEM II. It converts the high freg. of your factory amp into a low freg. that an aftermarket amp can handle and handle all the feedback. If done correct you should be fine putting one in.
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