www.linkmeup.com -- Audiolink PD4 lets you hook up a 3rd party head unit to a factory Bose system.

...I have my Riocar working in a 2001 Nissan Maxima with a factory Bose installation. The Riocar sounds better hooked up to the Bose system than the Bose head unit did! VERY satisfied with my purchase.
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-Riskable "I have a license to kill -9"