I see this on the switch tables on tuner cat. I have a maf car (94), would there be any advantage to using this if its even possible. Thanks again guys, Prorac1

 

If you un-check that box you will be locked in speed density mode.
The computer will no longer take input from the maf sensor and will rely mostly on the volumetric efficiency tables to calculate its fueling under different loads/rpm.
In your case I see no reason for it to be an advantage unless the maf sensor on the car is bad.