Dodge 2016 Viper SRT ACR Owner's Manual page 8

CAUTION:
Replace rub strips when they are worn down to 3/8 inches (10 mm) on the
front edge. This will avoid damage to the carbon fiber panel. Refer to image in 2.3
Track Extension.
Regularly inspect the outboard knock-in threaded insert to avoid premature splitter wear
(right and left side). Replace these fasteners as needed in order to protect the carbon
fiber splitter panel.
2.3 Standard Track Extension
A splitter track extension is shipped with every Viper ACR. The track extension is
mounted in the same location as the center rub strip. The on-track aerodynamic balance
was optimized with the track extension in place.
To install the track extension, remove the 14 screws from the center rub strip and install
the extension in the same mounting locations.
Tighten fasteners to 70 in-lb (7.9 N·m).
CAUTION:
The track extension should only be used during closed circuit track events.
The track extension can cause premature damage to your vehicle if used on public roads.