Dodge 2008 Viper Supplement - Manual (Page 9)

Wing Adjustment
It is possible to adjust the wing using the hole pattern at the top front of
the stanchion.
Note: Adjustment to the wing setting is not recommended.
The wing is attached to the lower stanchions with thread locker and tamper
resistant fasteners. The warranty does not cover any modifications or
removal of these wing fasteners.
In general, moving the wing up (e.g. Hole 2 to Hole 1) will decrease
rear down force and decrease overall understeer. Moving the wing down
(e.g. Hole 2 to Hole 3) will increase understeer.
Each successive hole increases the wing angle of attack by 1.5 degrees.
Adjustment
hole numbering
Example: Hole 4