Thread: JB4+ VS. BMW Performance power kit
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      04-15-2012, 10:05 PM   #8
Fumus
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Drives: 2023 X1 xDrive28i
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Kobb tuner is your best bet. You can't void your warranty if BMW can't detect you did.

http://www.1addicts.com/forums/showthread.php?t=472814
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