This takes the place of the Aux input. I previously used a BT adaptor in the aux jack and was never happy with the audio quality to be honest. Not sure if they used better grounds or shielding for the input or if its something else but over BT the audio is great. No feedback or distortion.Thank you for donating your car to get this working. That is awesome. Everything sounds like its perfect now and I can get one of them on order finally. Hopefully the listing will go back up soon.
Does the aux input jack still work with this setup? Just wondering if we could connect a good bluetooth adapter for audio instead of using the android auto connection. I can email them for this answer as well since it gets a bit specific into things.
edit - There is a direct BTA plug in that doesn't require Android Auto/Apple Carplay as on of the stock apps/options on the Grom dashboard! Just makes your car act like bluetooth headphones. Steering wheel buttons and center stack control all work for this as well.