My best advice to you is run all new wiring and avoid lots of frustration trying to bypass the bose. I installed all new door speakers and a new hu yesterday...it took me twice as long to install it, after i repaired the hacked up harness, i was getting no sound through the new speakers. What i did was use the orange(constant 12v power) green(switched 12v power) black (ground) to power up the new hu and ran all new speaker wire from the doors back to the hu until i hook up the amps
I taped up and tucked the rest of the wires on the wire harness as far back as i could bury them.
On another note, all the youtube videos i've watched all said to basically destroy all the plastic and remove the metal brace AND to order a new dash bezel...i was able to fit the double din hu with no problem
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