I'm not sure about the non-bose but on my bose system, the usb cable ran directly from the center console to the back of the stock headunit. I was able to buy an adapter cable that fit the factory cable plug and had the male usb on the other end that plugged into my aftermarket headunit.
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Fast Intentions "Stage Seb" twin turbo #098- Specialty Z/Tial-Xonarotor/CJM/Ecutek/HKS/KW/SPL/Hotchkis/Rohana/Toyo
700+whp
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