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jrdoming jrdoming is offline
Junior Member
Posts: 52
Join Date: Aug 2014
Car: 335i
Default 09-30-2018, 12:30 PM

Originally Posted by Terry @ BMS
So you don't have a JB4 yet nor a log of how your specific car is running but want me to provide you with "hypothetical" JB4 tuning advice? Generally, if running exhaust modifications you'll need to set FUA = 20 to offset dutycycle causing boost to go over target and corresponding excessive throttle closure.

In my testing the exhaust mods added zero power or benefit, I would not suggest them in most situations, whether tuning with JB4, flash tuning, or both.
Terry is there ever a point where you *need* to modify your pipe/exhaust due to concern over exhaust gas temp etc? Much like the stage 2 "tunes" saying you need some type of aftermarket ******** to run them long term.

2017 340i M Sport. JB4
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