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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
Platform: 2004-2021 Subaru WRX STI 6MT
XG-150 High carbon alloyed iron materials
This reduces heat soak into the intake air
Manley Turbo Tuff Pro Series I Beam Connecting Rod - SINGLE ROD - 2002-2014 Subaru WRX / 2004-2021 STI (EJ20/EJ25) PDM_differential-covers It makes sense for high-powerExperience 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