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For clarification. I emailed Jeff at Burger Tuning last week and he verified that Stage 1 will need to be purchased in addition to the stage 2 upgrade if you want to run stage 2 right away. There is also a USB datalogging cable specific to the device in order to get updates, map changes, etc for $35. Its $599 total for the Stage 1, stage 2 upgrade and the USB cable. The Stage 1 has specific wires to install the device before stage 2 can be wired in.
I have 9/10 production date, so I will be using harness A for my 2011 535. I believe both stages will still need to be purchased for newer models as well.
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