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If your after market amp has a high level input, the easy way is to get a line level adapter to convert a stock speaker wire output into the input signal needed. They sell these at most Home/auto retailers. Not the best way to do this in terms of sound quality, but it will keep most of the factory stuff intact. Special adapters do exist that can convert a speaker signal into an RCA output but thats mostly left for custom application and you would have to visit a custom install shop$$$$$.
Again, a speaker wire line level converter is your best bet if your amp has a high level input.
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