These are the settings in the engine.ini that need to be changed in order for it to sound correctly. Don't forget that if you change the RPM value in the engine.ini, you will need to change the RPM|Torque values in the power.lut file
RPM - 8500
LIMITER - 8500
LIMITER_HZ - 140
IDLE RPM - 1000
RPM_THRESHOLD - 9500
LAG_DN=0.994
LAG_UP=0.997
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Enjoy!