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The JB4 tune for N54 is very popular in the 3 series forums - there is also one for N55. It is a well proven and tested tune. I ran it for 4 years on my N54 335i. It's good for about 100 crank hp and 80whp - this is not hyperbole, there are scores of dyno charts that show between 340 and 350 wheel HP.
$529 is a no brainer.
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2006 E90 330i (retired)
2009 E90 335i (retired)
2012 E70 X5 50i M Sport (retired)
2016 F10 535i M Sport
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