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I asked about this at the local high-end stereo shop in my and they said they could do it for an extra $80 on top of the installation fee. Not sure exactly how they would do it but the guys says I would need a relay and they can do it w/o splicing into any wire.
I would suggest checking with reputablecar stereo shop in your area. The place i went to was called Myer-emco in the MD/DC/VA area.
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