Forge Motorsport for your F8X M3/M4

Unique to the market, the Forge BMW M3/M4 S55 Chargecooler system uses an expansion tank rather than a header tank like the OEM system. There is a filler cap located at the highest point on the Chargecooler allowing you to be sure that the charge is 100% full of coolant with no air pockets. This maximizes the efficiency of the heat rejection of the coolant within the Chargecooler water jacket.