Hello, I have a 2010 Release Series 7.0 with the stock Alpine head unit, I use my phone 100% to get media to the stereo and the AUX input between the seats is just to low volume, even adding a Bluetooth adapter into the 3.5 is not usable when listening to podcast, the volume is
just to low, so my question is when I add an aftermarket Double Din media player like a Pioneer MVH-S622BS do I need anything special besides the standard wiring harness adapter? The stock unit has controls for a subwoofer and I was wondering if I need something to retain its use?
Thanks for any info.

I'm not really concerned about retaining the steering wheel controls.

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Reverse Wire harness and the Dash Kit. That's it.

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You're also going to want a parking brake bypass. It just makes life so much easier.