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The PAC will work but you'll need their CAN interface as well. Two separate interfaces...the SWI-XXX (XXX = whatever radio manufacturer you need) is the interface to your specific radio, the SWI-CAN or CAN2 interprets info off of the CAN-bus and sends it directly into the SWI-XXX. The E82 doesn't come up on their online app guide, but I'm pretty sure it works. Just call the 800 number and ask tech support...they're a good bunch of guys.
But be warned that the can+ and can- pins on their instructions are labeled backwards. Ran into this during my last E90 hu swap.
The Metra interface will also work, and only one piece is required, but there's a lot more programming involved. I prefer PAC for steering wheel integration whenever it's an option.
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