Manley 15024R6-4 H-Plus Connecting Rods for 2002-2021 Subaru WRX/STI EJ20/EJ25

Vehicle Fitment

• 2002-2005 Subaru WRX (EJ205 2.0 L)
• 2004-2021 Subaru WRX STI (EJ25 2.5 L)
• Applicable Subaru EJ20/EJ25 performance engine applications (EJ207 / EJ255 variants)

Features

• High-strength H-Plus series connecting rods designed for high-power applications
• Forged 4340 steel construction for durability under extreme loads
• Heat treated, stress relieved, shot peened, and magnaflux inspected for reliability
• Precision machined to exact tolerances with weight matched set for balanced performance
• H-beam profile delivers increased safety margin for high-boost/turbo engines
• Equipped with high-quality ARP 2000 cap screws for secure clamp force
• Rated to support up to ~750 hp when properly built into the engine
• Complete set of four rods - ready for performance rebuilds or upgrades

Specifications

• Rod type: H-beam connecting rods (H-Plus series)
• Material: Forged 4340 steel
• Center-to-center length: 5.137 in
• Big end bore: 2.165 in
• Big end width: 0.840 in
• Pin diameter: ~0.9055 in (23 mm)
• Pin bore: 0.9063 in
• Approximate weight: ~575 g per rod (weight matched +/- 1.5 g)

Included Components

• 4x Forged H-beam connecting rods (H-Plus series)
• 4x High-strength ARP 2000 cap screws

Product Description

The Manley 15024R6-4 H-Plus Connecting Rod Set is engineered for high-performance Subaru EJ engines, including 2002-2005 WRX and 2004-2021 WRX STI platforms with EJ20 and EJ25 engine families. These rods are forged from premium 4340 steel and processed with heat treatment, stress relief, shot peening, and magnaflux inspection to ensure durability and reliability under extreme power and boost conditions typically encountered in tuner and motorsport applications.

Designed with an H-beam profile and weight-matched construction, this set offers enhanced strength and reduced risk of fatigue failure when building high-horsepower engines. The included high-quality ARP 2000 cap screws help maintain secure clamp force and reliability throughout high-RPM operation. Rated to support engines making up to ~750 hp when properly built, the 15024R6-4 set is ideal for performance rebuilds or upgrades in turbocharged WRX and STI builds. Whether for street, track, or rally use, this connecting rod set provides the strength and precision needed for demanding Subaru EJ engine applications.