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LessIsMore LessIsMore is offline
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Posts: 1,138
Join Date: Aug 2012
Car: 2009 535i Sport SAT
Default 09-11-2019, 08:10 PM

Why? JB4 works with flash tune. No need to give up the boost by gear, logging, etc. Plus if BMS hold to their promise, next firmware update should have good safety features built in (protect against lean afr, overboost, low fuel pressure, etc.) that flash tunes cant do.

2017 AMG C63 -JB4
2009 535i - 548whp - sold
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