Just installed my SUPERCHIPS "3815" last night, figures it had to rain so i couldnt see just how much difference it made other then in the revs, BUT today i got to take it for a ride AND............ MY HATS OFF TO THE GUYS AT SUPERCHIPS !!! worth every penny.

Anyone see a difference in the 87 and the 91oct setting? Also, i dont really do much towing but what kinda difference do those settings make?