Manley 15024-1 H-Tuff H-Beam Connecting Rod Set 5.137" for Subaru EJ20/EJ25

Vehicle Fitment

• Subaru WRX / WRX STI (EJ20, EJ25) engines - 2002-2014 WRX, 2004-2020 STI

Features

• Forged 4340 alloy steel H-Beam connecting rods built for high-output applications
• Center-to-Center Length: 5.137" (130.5 mm) for direct fit in EJ20/EJ25 engines :contentReference[oaicite:0]{index=0}
• Big End Bore: 2.165"; Big End Width: .840" - designed for billet bearings and high load tolerance :contentReference[oaicite:1]{index=1}
• Pin Diameter: .9055" (23 mm); Pin Bore: .9063" - optimized for high-RPM stability :contentReference[oaicite:2]{index=2}
• Shot-peened, stress-relieved and magnaflux-inspected for maximum fatigue resistance :contentReference[oaicite:3]{index=3}
• Each rod is weight-matched within ±1.5 g for high precision in high RPM builds :contentReference[oaicite:4]{index=4}
• Standard with ARP 3/8" ARP 2000 rod bolts; H-Tuff design offers wider beam for extra safety margin
• Ideal upgrade for turbocharged or high-boost EJ-series Subaru engines where stock rods may be limiting

Specifications

• Part Number: 15024-1
• Rod Set: Typically sold as a single rod; order matching quantity for full engine (e.g., 4 for a 4-cyl) :contentReference[oaicite:5]{index=5}
• Center-to-Center: 5.137" (130.5 mm)
• Material: Forged 4340 alloy steel
• Big End Bore: 2.165"; Big End Width: .840"
• Pin Diameter: .9055"; Pin Bore: .9063"

Included Components

• 1x Manley 15024-1 H-Tuff H-Beam Connecting Rod (single)*

Product Description

The Manley 15024-1 H-Tuff H-Beam Connecting Rod is a high-performance upgrade crafted specifically for Subaru WRX and STI vehicles equipped with the EJ20 and EJ25 engines. With its 5.137" (130.5 mm) length and robust forged 4340 construction, it's designed to handle elevated boost levels, high RPMs and the demands of serious tuning work.

Built to endure the stresses of high-output engines, each rod is shot-peened, stress-relieved and magnaflux inspected. The heavy-duty design incorporates a larger cross-section beam, high-strength ARP 2000 bolts, and precision machining for balance and durability. If your Subaru is making serious power or you're planning a forced-induction build, this rod is a smart choice.

Because the part is sold per rod (rather than as a full set), it's critical to order the correct quantity (typically four for a 4-cyl engine) and to ensure proper balance, correct bearing clearances, torque specifications and full engine assembly discipline. Use this part when your build demands reliability beyond OEM limits.