Do You Have a Charger or a Challenger? GHF CHILLER TANK: BUMPER TANKadds 3 gallons of liquid to the superchargers cooling system, allowing maximum efficiency from your chiller system. This product eliminates the fatory heat exchanger. One end goes to the chiller sys. the other goes to the Chiller tank.  Vaccuming down the sys is the best way to maximize cooling.