COBB Stage 1 to NexGen Stage 2+ Flex Fuel Power Package Upgrade Black (SUB004NG2S1FF-S1-UP-BK) | Subaru STI 2015-2018

The COBB Stage 1 to NexGen Stage 2+ Flex Fuel Power Package Upgrade Black (SUB004NG2S1FF-S1-UP-BK) enables 2015–2018 Subaru STI owners to transition from a basic Stage 1 setup into the more advanced NexGen Stage 2+ Flex Fuel configuration. This upgrade enhances airflow efficiency, unlocks ethanol-blended fuel capability, and allows the EJ engine to take full advantage of COBB’s NexGen Flex Fuel tuning logic for smoother boost response, improved knock resistance, and greater tuning versatility.

KEY FEATURES

• Upgrades a Stage 1 Subaru STI to full NexGen Stage 2+ Flex Fuel configuration
• Supports E85 and blended ethanol fuels through COBB’s NexGen Flex Fuel strategy
• Improves airflow and reduces system restriction for enhanced turbo performance
• Black component finish offers a clean, cohesive under-hood appearance
• Provides stronger midrange torque, more stable knock control, and smoother drivability
• Compatible with COBB NexGen Stage 2+ Flex Fuel OTS maps and custom tuning
• Engineered for OEM-like fitment and reliable long-term performance

TECHNICAL SPECIFICATIONS

• Platform Compatibility: Subaru STI 2015–2018
• Upgrade Type: Stage 1 to NexGen Stage 2+ Flex Fuel hardware transition
• 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: Enhanced airflow, expanded tuning headroom, improved combustion stability
• Included Components: Hardware required to complete the NexGen Stage 2+ Flex Fuel upgrade
• Application: Street and performance builds seeking ethanol-enabled power gains

VEHICLE FITMENT

• Subaru STI 2015–2018

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