Lots of different routes to go for this. If you're running a piggyback tune they can tap the data off the canbus and log to a laptop via usb. Otherwise you could go for a standalone setup by a variety of companies out there.
For track data you could use something like the Traqmate setup.
Personally I was running a proceed on my old 135i and was using that to log AFRs, boost, oil and water temps etc. Currently looking into an Innovate Motorsports LC-1 / MTX-L setup to log AFR's
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U WOT M8?
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