and use the rest of the bose system? yes, you could in theory, splice the line outs from the alpine into the stock harness, but i don't think i've heard of anyone doing that.
you will lose some or all of the lcd functionality.
that adapter simply splits the audio output from the HU into 2 sets of signals, one that is unchanged and plugs back into the stock harness to the speakers or bose amp (if you are still using some or all of the stock system), and then the extra 4ch set of line level signals for the additional amp(s)...
so it doesn't affect the functions of the oem radio or steering controls in any way.
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