Koyo 08-15 Subaru WRX / STI 05-09 Subaru Legacy GT 2.5L (MT / w/ Filler Neck) Radiator

The Koyo Hyper-V Core Radiator with Filler Neck is an all-aluminum racing radiator designed to enhance cooling performance in high-heat applications. Part of Koyorad's Hyper V-Core Series, this radiator features a high-efficiency core optimized for extreme heat conditions and limited space environments. Its innovative design addresses airflow restrictions caused by modern engine bay crowding, ensuring superior heat dissipation. Constructed from durable aluminum, the radiator offers excellent thermal conductivity and corrosion resistance, making it suitable for demanding racing and performance driving scenarios. The inclusion of a filler neck simplifies installation and maintenance, providing a reliable solution for cooling system upgrades where factory units may fall short.

Designed for multiple Subaru models with specific fitment requirements, this radiator is compatible with vehicles experiencing space constraints and requiring enhanced cooling capacity. It is ideal for street, track, or off-road use, especially in applications where factory radiators cannot deliver sufficient airflow or heat rejection. The radiator serves as a direct replacement for OEM units, featuring bolt-on installation with no modifications needed. It is suitable for vehicles with engine configurations that generate extreme heat, and it is recommended for drivers seeking improved engine cooling performance under demanding conditions. The kit includes the radiator and filler neck, ensuring a straightforward upgrade process for compatible Subaru models.