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For HRPIII, if you replace the radio with a double din, why would you want to retain STOCK XM, PDIM, onstar nav, ect? They will still work, as in not being REMOVED from the car, but trying to get all theese stock pieces to work with an aftermarket radio would be almost pointless. The only thing I see being useful is steering wheel controls, which are easily integrated into my kit. The heated seats are retained as well. And hopefully any new unit you would get would have bluetooth built in (with caller ID that actually works rather then GM's that just displays the #)
I think that answered all your questions.
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