COBB Stage 1+ to NexGen Stage 2+ Flex Fuel Power Package Upgrade (SUB004NG2FF-S1P-UP) | Subaru STI 2008-2021

The COBB Stage 1+ to NexGen Stage 2+ Flex Fuel Power Package Upgrade (SUB004NG2FF-S1P-UP) provides 2008–2021 Subaru STI owners with the hardware required to advance from a Stage 1+ configuration into a full NexGen Stage 2+ Flex Fuel setup. This upgrade unlocks ethanol-blended fuel capability, enhances airflow efficiency, and enables the advanced logic of COBB’s NexGen tuning framework for stronger knock resistance, greater tuning versatility, and smoother overall power delivery.

KEY FEATURES

• Transitions a Stage 1+ Subaru STI into full NexGen Stage 2+ Flex Fuel configuration
• Enables E85 and blended ethanol fuel usage with COBB NexGen Flex Fuel tuning
• Improves airflow and reduces restriction to support higher power output
• Integrates seamlessly with COBB’s NexGen OTS Flex Fuel calibrations
• Enhances turbo efficiency, throttle response, and mid-range torque
• Provides a strong performance foundation for future modifications
• Engineered for OEM-like fitment and reliable long-term durability

TECHNICAL SPECIFICATIONS

• Platform Compatibility: Subaru STI 2008–2021
• Upgrade Type: Stage 1+ to NexGen Stage 2+ Flex Fuel transition kit
• Fuel Support: Pump gas, E85, and ethanol-blended mixtures
• Tuning Requirement: COBB NexGen OTS Stage 2+ Flex Fuel maps or custom NexGen tuning
• Performance Gains: Increased tuning headroom, improved combustion stability, enhanced turbo response
• Included Components: Core hardware required for NexGen Stage 2+ Flex Fuel capability
• Application: High-performance street and track builds seeking ethanol compatibility and increased output

VEHICLE FITMENT

• Subaru STI 2008–2021

COBB delivers proven, data-driven performance solutions engineered to optimize your Subaru with unmatched precision and reliability.