The IAG Triple Pass Street Series 42mm Radiator is a high-performance aluminum radiator designed specifically for 2002-2007 WRX and 2004-2007 STI Subaru models with the GD chassis. Engineered to cool more efficiently than the OEM radiator, this lightweight upgrade is perfect for heavy-use applications and engines with performance modifications that tend to run hotter. The all-aluminum construction provides superior heat dissipation, ensuring your engine remains at optimal temperatures even under extreme conditions. IAG’s Triple Pass Street Series 42mm Radiator is the ideal choice for enhanced cooling performance and reliability.

The IAG Triple Pass Street Series 42mm Radiator utilizes an advanced 3-pass design, featuring internal baffles within the end tanks that route the coolant through the radiator three times from inlet to outlet. Unlike the single-pass design of the OEM radiator, this innovative approach ensures the coolant stays inside the radiator longer, resulting in a significant increase in cooling efficiency. On average, the 3-pass design improves cooling performance by 10-20% over stock, providing your engine with better thermal management even during intense performance scenarios.

The IAG Triple Pass Street Series 42mm Radiator is constructed from lightweight and durable aluminum, making it less likely to crack or bend even under high temperatures. Aluminum's excellent heat conductivity and rapid absorption properties allow the hot coolant to cool more quickly as it passes through the tubes. Additionally, aluminum offers superior resistance to corrosion, ensuring a long lifespan and reliable performance. The IAG Triple Pass Street Series 42mm Radiator is built to endure the demands of high-performance applications while providing efficient cooling and durability.

The upper radiator inlet on the IAG Triple Pass Street Series 42mm Radiator has been relocated and requires the included IAG 4 Ply Silicone Upper Radiator Hose (Part #IAG-ENG-2304) for installation. A -6 AN Male Fitting is welded on one end for applications that need a coolant expansion tank. For applications that do not need this fitting, a -6 AN female cap is included.