IHI VF34 Turbocharger – Subaru WRX / STI / Forester XT / Liberty GT (EJ20 / EJ25)

The IHI VF34 Turbocharger is a high-performance, bolt-on upgrade for Subaru WRX, STI, Forester XT, and Liberty GT models equipped with EJ20, EJ22, and EJ25 engines. Standard on all STI models from late 2001, the VF34 offers the same specifications as the VF30 but features a ball bearing cartridge assembly, delivering faster spool and improved throttle response.

With its ball bearing design, 479 compressor wheel, and P18 turbine housing, the VF34 spools approximately 250–500 RPM quicker than the VF30, making it an excellent all-round performer. It is capable of holding boost to higher RPM compared to the factory TD04 turbo, while still offering quick spool characteristics. Although slightly more laggy than the TD04, the difference is minimal, and the VF34 provides significantly better top-end performance.

Sharing the same exhaust housing and compressor as the VF30, the VF34’s ball bearing core achieves full boost sooner without sacrificing maximum output, making it a great balance between response and power.

Key Features:

• Ball bearing turbocharger for faster spool and improved response
• Identical exhaust housing and compressor to VF30, with quicker boost delivery
• 479 compressor wheel and P18 turbine housing
• Bolt-on fitment for Subaru EJ20, EJ22, and EJ25 engines
• Ideal balance between low-end spool and high-RPM performance

Warranty Notes:

• Turbos rarely fail without external causes such as oiling issues, debris, or blow-by
• Customer is responsible for shipping and inspection costs for warranty claims (refunded if approved)
• Investigate and resolve the cause of any previous turbo failure before installation to avoid repeat issues