Thread: Best Exhaust
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      06-20-2015, 01:21 PM   #14
mike@x-ph.com
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Drives: 07-335/12-328/18-M4/21-M4CP
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Quote:
Originally Posted by jlux View Post
what is JB4 or the BMS module?
Jb4 is the most popular tune for your car. It adds ~50 whp and ~wtq on a completely stock car.

The BMS can flap module, is used to deleted codes and control the exhaust valves.
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