It's a bit of work to put together, but nothing compares to a DIS/INPA system on a laptop. You can do the whole thing for <$200 or about $50 if you already have a laptop.

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2012 xDrive35d
2001 BMW X5 3.0i 5MT
and two 1987 Corvettes - Callaway Twin Turbo and Guldstrand Grand Sport 80
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