Synergy's Expansion tank system for the C7Z06, can be used as a single 2.5 gallon tank, or in a twin configuration giving you a full 5 gallons. Each tank hides in the front of the bumper in each front corner. System is designed to be plug and play, complete with pre made lines and fittings for easy install. If using the single tank, then the tank would replace the passenger side plastic coolant bottle from the factory. The twin tank system adds the driver side tank. Can be used with stock heat exchanger or upgraded versions. Will also work with engine bay tanks such as the Cordes performance tank.