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The Koyo radiator for 2003–2007 Subaru Impreza WRX/STI manual models (with filler neck) is a vehicle-specific replacement core that includes the required filler neck configuration. It aligns with WRX/STI mounting and hose locations to maintain coolant circulation and system fill behavior for owners replacing or servicing the factory radiator.
Koyo 03-07 Subaru Impreza WRX/STI (MT / w/ Filler Neck) Radiator
