Manley Turbo Tuff Pro Series I Beam Connecting Rod - SINGLE ROD - 2002-2014 Subaru WRX / 2004-2021 STI (EJ20/EJ25) PDM_differential-covers This reduces heat soak into

This reduces heat soak into the intake air

The springs are developed and validated at Whiteline's Australian facility using the same engineering process applied to their motorsport components -- progressive rate

It makes sense for high-power builds where the sprung twin is marginal and a twin ceramic would be too aggressive for the intended use

This could very well be the ultimate oiling solution in the EJ25 platform

Manley Turbo Tuff Pro Series I Beam Connecting Rod - SINGLE ROD - 2002-2014 Subaru WRX / 2004-2021 STI (EJ20/EJ25) PDM_differential-covers This reduces heat soak intoExperience the pinnacle of connecting rod technology with our Pro Series rods, designed for ultimate performance. Superior Materials: These rods are available in two exceptional materials: forged 4340 or 300M vacuum degassed steel alloys, engineered for unparalleled performance and durability. NHRA Legal Certification: Certain SKUs within the Pro Series I Beam range have earned "NHRA Legal" certification, ensuring compliance with NHRA legality