Supertech Subaru EJ25 (w/o Turbo) Black Nitrided Intake Valve - Set of 8

Supertech SIVN-1025-8 – Black-Nitrided Intake Valve Set (Subaru EJ25 SOHC, NA)

Supertech’s SIVN-1025-8 kit contains eight performance intake valves engineered for naturally-aspirated Subaru EJ25 SOHC engines built between 1999 and 2012 (Impreza, Forester, Legacy, Outback, Baja). Each valve is forged from EV8 (21-4N) stainless steel, then finished with a Black Nitride surface that hardens the stem, lowers friction and boosts temperature resistance.

Key Features

• 37 mm head (+1 mm oversize) delivers a larger curtain area for improved airflow and stronger top-end power.

• Black Nitride coating (~52 HRC) creates a slick, wear-resistant surface that extends guide life and resists valve float at high RPM.

• One-piece forged construction eliminates weld seams, ensuring superior fatigue strength under sustained high-load operation.

• Single-groove keeper design is compatible with most Supertech and OEM spring/retainer packages for straightforward installation.

• Supplied as a complete set of 8 valves—replaces every intake valve in the four-cylinder head.

Technical Specifications