Thanks for sharing! I'm just about out of the powertrain warranty, so it's only a matter of time before I spend money I really don't have on something I definitely don't need, but this is at the top of the list now.
I replaced the stock (non-B&O) speakers with Infinity Reference REF-6532IX, Metra 72-5602 harness adapters, and Metra 82-5605 adapter brackets. Crutchfield doesn't think these speakers fit, but they do. Cautionary note: I had an issue with the supplied screws. I had to find slightly larger...