The BMS F90 Stage1 is the absolute best value in F90 tuning, installs in 30 seconds, drives as smooth as stock, and provides solid 50-60whp gains. Via the simple TMAP connections only so much performance can be added and the Stage1 maximizes that performance. No other Stage1 type product can make more power because there is only so much power to be made without EWG control and CANbus control like the JB4 offers.
