1.5 Inches in KYB AGX limit as per listed in my manual from KYB.

The AGX products have the following approximate damping force values.
When adjusted, both rebound and compression damping forces change.
Setting#: Relative Value
1 - Same as Factory 100
2 - Same as our GR2 products (10~15% firmer than Factory) 115
3 - 50% firmer than #2 172
4 - 30% firmer than #3 223


For an eight position adjustable product, the damping force values are approx.
the following:
With #2 being Factory at a relative value of 100,
#1 = 95 (5% softer than Factory #5 = 143.5 (43.5% firmer than Factory)
#2 = 100 (Factory damping force) #6 = 172 (72% firmer than Factory)
#3 = 107.5 (7.5% firmer than Factory) #7 = 197.5 (97.5 firmer than Factory)
#4 = 115 (15% firmer than Factory) #8 = 223 (123 % firmer than Factory )