COBB Stage 1 to NexGen Stg 2+ Flex Fuel Redline CF Power Package Upgrade (SUB004NG2S2FF-RED-S1-UP) | Subaru STI 2015-2021

The COBB Stage 1 to NexGen Stg 2+ Flex Fuel Redline CF Power Package Upgrade (SUB004NG2S2FF-RED-S1-UP) provides 2015–2021 Subaru STI owners with the essential hardware to transition from a Stage 1 setup into a full NexGen Stage 2+ Flex Fuel configuration enhanced with Redline Series carbon fiber components. This package unlocks ethanol-blended fueling capability while improving airflow efficiency and engine responsiveness, allowing COBB’s NexGen tuning to deliver stronger knock resistance, smoother boost behavior, and increased tuning flexibility.

KEY FEATURES

• Upgrades a Stage 1 STI to the full NexGen Stage 2+ Flex Fuel configuration
• Redline Carbon Fiber components reduce weight and improve intake airflow
• Supports E85 and blended ethanol fuels via NexGen Flex Fuel calibration
• Enhances turbocharger performance with improved airflow and reduced restriction
• Provides smoother torque delivery, sharper throttle response, and improved combustion stability
• Compatible with COBB NexGen Stage 2+ Flex Fuel OTS maps and custom tuning
• Premium Redline carbon fiber finish delivers a high-end motorsport appearance
• Engineered for clean, precise, OEM-like integration

TECHNICAL SPECIFICATIONS

• Platform Compatibility: Subaru STI 2015–2021
• Upgrade Type: Stage 1 to NexGen Stage 2+ Flex Fuel with Redline CF components
• Material: Redline Series carbon fiber intake hardware
• Fuel Support: Pump gas, E85, and ethanol-blended mixtures
• Tuning Requirement: COBB NexGen Stage 2+ Flex Fuel OTS calibration or custom NexGen tuning
• Performance Benefits: Increased tuning headroom, improved turbo efficiency, enhanced knock resistance
• Included Components: Redline CF intake parts plus required NexGen Stage 2+ Flex Fuel hardware
• Application: High-performance street and track builds seeking ethanol capability and premium aesthetics

VEHICLE FITMENT

• Subaru STI 2015–2021

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