I have also the B48B20A.
To be honest, I don't know the exact boost values. There is a smartphone app where you can change the "levels" between 1-15. The manufacturer told me that the default setting is #6 and each level up adds about 2%.
The above values were measured at #8. ( it means a difference between 100-200km/h about 3.5-4 seconds according to Dragy. )
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