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I had a JB4 stage 1 tune on my 2013 3.5 and loved the power until........
Reduced power mailfunction and tranny issues
Took the tune out and had it towed to bmw
ended up my DM2 computer and ECU were fried as well as some of my tranny parts
The car was in the shop over 2 weeks getting repaired and everything was covered under warranty (thankfully)
Will never tune this thing again
on the other side, my old E92 335 was jb4 tuned and no issues
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2013 X6 - retired
2015 X6 - retired
2015 435GC - retired
2018 X5 40e - retired
2020 X5 M50i - Current
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