Coolant Expansion Tank Dodge Hellcat/STR8 14-Up

The Coolant Expansion Tank for Dodge Hellcat and STR8 models from 2014 and up is purpose-built for extreme-duty cooling system management in high-performance muscle cars. When you're pushing a supercharged engine to the limit, your factory cooling system often falls short—inadequate expansion capacity leads to pressure buildup, coolant overflow, and potential thermal runaway. This MOROSO tank solves that problem by providing increased coolant volume and pressure relief capacity, critical for street and track applications where sustained high rpm and boost levels stress factory components beyond their design envelope.

Designed specifically for the Hellcat and STR8 platform, this expansion tank integrates seamlessly into the OEM cooling circuit without requiring complex modifications or custom plumbing. The larger capacity accommodates thermal expansion generated by aggressive tuning, forced induction, and continuous wide-open-throttle operation—conditions that cause standard tanks to overflow or create air pockets in the cooling system. MOROSO engineered this unit with proper baffling and surge chamber design to prevent aeration, maintain consistent coolant pressure across temperature cycles, and eliminate the hot spots that compromise head gasket integrity on supercharged engines.

Dodge Hellcat and STR8 owners running modified powerplants—whether upgraded boost levels, port-and-polish work, or forced-induction conversions—benefit most from this upgrade. Installation is straightforward on 2014-and-newer models, and the unit pairs perfectly with upgraded radiators, larger water pumps, or enhanced intercooler setups. At 4.88 lbs and compact 12×12×14-inch dimensions, it fits tight engine bay packages without sacrificing underhood ergonomics, making it ideal for both street machines and dedicated track builds where reliability under thermal stress is non-negotiable.