Smart Box provides the following functions:

Manual Mode:

• Precise manual adjustment of VAREX exhaust valve positions;

• Custom pre-set of VAREX exhaust valve position

MATRIX MODE (ONLY WORKS WITH VEHICLES EQUIPPED WITH OBD-II):

• Automatic control of VAREX exhaust valve positions based on real-time information of RPM, throttle and speed.

GEO MODE:

• Automatic control of VAREX exhaust valve positions based on the real-time location of the vehicle.
  
  The acclaimed VAREX Exhaust System was invented by XForce Performance Exhaust - it has been the most popular choice amongst enthusiasts who are seeking flexible control of their sound level.  The VAREX exhaust system allows users to adjust the exhaust sound from stock-car-quiet to sports-car-growl with a click of a key fob button.  We love our VAREX exhaust and prefer to keep it in ‘open mode’. However, there are always moments when the high volume exhaust is less desirable.