4PCS Forged Connecting Rods Set 12100AA181 for Subaru WRX STI Forester 2008-2021 EJ257 Turbo Engine Direct OE Replacement

Maximize your STI's potential with these 4pc Forged Connecting Rods designed for EJ257 engines. Turbo-ready construction handles 35+ PSI boost with H-beam geometry that redistributes stress points. Weight-matched to 0.5g tolerance for buttery-smooth operation at 8,000 RPM.Performance Features:- Plasma-nitrided surface treatment- Bronze-bushed small ends- Shot-peened stress relief- ARP 2000 bolts withstand 190,000 PSISpecifications:Material: 4340 Forged SteelFitment Type: Direct ReplacementCompatible Models: 2008-2021 WRX STI (GR/GV) 2015-2021 Forester XT 2013-2017 BRZ Turbo conversions 2010-2014 Legacy GTPart Numbers:12100AA181, 12100AA291, 12100AA190, 12100AA292, 12100AA293, 12100AA294Critical Installation Requirements:1. Requires resizing for proper big end bore2. Torque ARP bolts to 42 ft-lbs with moly lube3. Check piston-to-valve clearance with new cams4. Balance entire rotating assembly5. Designed for EJ257 only - not EJ207/EJ205

• 🔩 Genuine Specs: Matches OE# 12100AA181, 12100AA291, plus 12100AA292-94. H-beam design identical to OEM STi specifications.
• 🚗 STi Applications: Fits 2008-2021 WRX STi (GR/GV/VA). Also compatible with Forester XT (2009-2018), Legacy GT (2010-2012) EJ257 engines. Supports 500+ WHP builds.
• ⚔️ Rally-Proven: Forged 4340 steel handles 8,500 RPM sustained load. 3D ultrasonic crack-tested with zinc anti-corrosion coating.
• ⚙️ High-Rev Ready: Balanced within 0.1% tolerance. OEM-spec bushings enable drop-in installation. Reduces rod flex in high-boost EJ257 engines.
• 🛡️ ZERO-RISK QUALITY ASSURANCE: All FIWARY STi connecting rods come with 12-month warranty against defects. Compatibility verification via VIN/OE number required.