Cobb 08-17 Subaru STi Fuel Rails

Part Details:

The COBB Fuel Rails are designed to support upgraded fuel delivery systems in Subaru STI models by providing consistent and balanced fuel distribution to each injector. These fuel rails are commonly used in performance-oriented builds where factory fuel components may become a limitation.

By improving fuel flow capacity and compatibility with aftermarket fuel system components, these rails help support higher power levels and modified fuel system configurations. They are frequently included as part of complete COBB fuel system packages and flex fuel upgrades.

Application & Compatibility

• Subaru STI (2008–2017)

Purpose & Use

Fuel rails play an important role in ensuring even fuel distribution across all cylinders, particularly in engines running upgraded injectors, higher fuel pressures, or ethanol-capable fuel systems. Upgraded fuel rails help reduce pressure drop and support stable fueling under load.

These fuel rails are commonly paired with upgraded fuel pumps, fuel pressure regulators, and fuel line kits as part of a complete fuel delivery solution.

Key Features

• Designed for Subaru STI fuel systems
• Supports increased fuel flow and injector compatibility
• Ideal for use in upgraded and performance-oriented fuel systems
• Commonly included in COBB fuel system and flex fuel packages

Recommended Supporting Fuel Components

• Fuel Injectors – upgraded injectors are commonly paired with fuel rails to support increased fuel flow and power goals.
• Fuel Pressure Regulators – help maintain consistent fuel pressure when running higher-flow fuel systems.
• Fuel Lines – ensure proper routing and compatibility when upgrading fuel rails.
• Fuel Pumps – provide the fuel volume required to support upgraded rails and injectors.

Learn more about COBB Tuning performance solutions and supporting components