Lingenfelter L250110309 Lingenfelter C6 ZR1 Corvette Supercharger Front Cover 2009-13 v2.2 - Manual (Page 35)

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125. DLC port cover kit installation.
126. Install the supplied diagnostic port (DLC
port) cover onto the DLC port in the driver foot
well. Secure the strap that retains the DLC
cover to the vehicle.
This cover is meant to notify dealerships
and other service facilities that this vehicle
has custom programming installed for new
supercharger pulley ratio and it should not be
programmed with the stock GM calibration
files when being serviced.
127. Start the engine and check from proper
belt alignment and listen to make sure you do
not have any vacuum leaks.