Subaru EJ20/25 Performance Parts.

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Subaru EJ20/25 Performance Parts.

The Subaru EJ20 and EJ25 have powered decades of turbocharged Impreza WRX and STI builds, and remain one of the most popular platforms in the New Zealand performance scene.

Whether you're freshening up a tired factory engine, building a stroker combination or just chasing reliability at higher power, we've pulled together a range of internals, fuel system and miscellaneous hardware from our suppliers to help get your EJ20/25 build sorted.

EJ20/25 Internals

We have a wide range of internals available for the Subaru EJ, sourced from various suppliers to suit different build levels.

ARP Head Stud Kit

ARP2000 head studs for Subaru Impreza WRX STI EJ205/EJ257 applications, giving reliable clamping force for boosted builds.

Kelford Cams Spring & Titanium Retainer Kit

A valvetrain upgrade for EJ20/EJ25 heads, pairing uprated valve springs with titanium retainers to handle higher lift and rpm.

Eagle 4340 Billet 79mm Std Crankshaft

A billet 4340 crankshaft for Subaru WRX EJ255/STI EJ257 builds, offering a stronger foundation than the factory cast unit for higher-power applications.

  • 4340 billet construction
  • 79mm standard stroke
  • Suits WRX EJ255 & STI EJ257
  • SKU: EA 3EJ231105137

Diamond Racing Forged Pistons

Forged pistons for the Subaru WRX EJ255, built to handle sustained boost and higher cylinder pressures than a factory piston.

  • 99.5mm standard bore
  • -12.0cc, 9.8:1 compression
  • Suits WRX EJ255
  • SKU: DIA 36015-4

Aeroflow Billet EFI Fuel Rails

We have a cool selection of EJ billet fuel rails from Aeroflow, available in top feed and side feed configurations across a few different colour options.

EJ20 Top Feed Conversion Billet EFI Fuel Rail – Black

EJ20/EJ25 Side Feed Billet EFI Fuel Rails – Red

  • Side feed configuration
  • Red finish
  • SKU: AF64-2057R

EJ20/EJ25 Top Feed Billet EFI Fuel Rail – Silver

  • Top feed configuration
  • Silver finish
  • SKU: AF64-2257S

EJ20 Top Feed Conversion Billet EFI Fuel Rail – Blue

  • Top feed conversion
  • Blue finish
  • SKU: AF64-2258

Miscellaneous EJ20/25 Hardware

Some more cool stuff from our suppliers for the EJ20/25 platform.

Aeroflow Subaru EJ25 Full Heater Hose Kit

Franklin Billet Alloy Cam Cover Seals

Aeroflow EJ20 & EJ25 Engine Mounts

ATI Super Damper Standard Harmonic Balancer

  • Standard damper
  • Suits EJ205/EJ257, fits Subaru WRX
  • SKU: ATI-917991

Building an EJ20 or EJ25?

Talk to the Stealth Ride team about your planned combination. We can help supply the internals, fuel system hardware and supporting components needed to bring your Subaru build together.

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