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they make a speaker level unit with preamp out puts, they sell em at wal-mart. this should be wut u need. it sells for about $20-25. thats the only was to add an external amp wit a factory head unit.
You lose some sound quality using the adapter. If you do not have amps already, just look for amps that have speaker (hi level) imputs. Your sound will be cleaner and they are not any harder to install.