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If you don't want to do the work yourself I don't see why an audio shop couldn't do it for you.My only concern with audio shops is that they are very quick to cut into your stock wiring which completely voids your warranty.Also,a lot of shops out there don't know about the pitfalls of ANC and when your new audio system has issues they don't know how to remedy it.

I've sold many ANC microphone bypass harnesses to people who get their audio done at a shop where they didn't know about the ANC nor what to do about the issues it was causing.
More info on the Harness please. I have a 2019 GMC Terrain.
 

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Greg,I sent you a reply in the private messages.
Hi, I’m interested in doing something like this. I have no idea what all this means but I know the 2019 terrain slt i just bought has some wimpy bass that’s hardly noticeable. I had to put my ear down to my door speakers to make sure they were working!
 
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