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

The COBB Stage 1 to NexGen Stage 2+ Flex Fuel Power Package Upgrade Blue (SUB004NG2S1FF-S1-UP-BL) provides 2015–2018 Subaru STI owners with the hardware required to advance from a Stage 1 setup into COBB’s NexGen Stage 2+ Flex Fuel configuration. This upgrade unlocks the benefits of ethanol-blended fueling while improving airflow efficiency and enabling the EJ engine to fully utilize COBB’s NexGen Flex Fuel tuning for stronger knock resistance, sharper boost response, and broader tuning flexibility.

KEY FEATURES

• Transforms a Stage 1 Subaru STI into full NexGen Stage 2+ Flex Fuel configuration
• Supports E85 and ethanol-blended fuels through COBB’s NexGen Flex Fuel tuning logic
• Enhances airflow and reduces restriction for improved turbocharger performance
• Blue component finish delivers a bold, motorsport-inspired engine bay appearance
• Improves midrange torque delivery, throttle response, and combustion stability
• Compatible with COBB NexGen Stage 2+ Flex Fuel OTS maps and custom tuning strategies
• Engineered for precise, OEM-like integration and long-term durability

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 blended ethanol mixtures
• Tuning Requirement: COBB NexGen Stage 2+ Flex Fuel OTS calibration or custom NexGen tuning
• Performance Benefits: Expanded tuning range, improved knock resistance, enhanced turbo efficiency
• Included Components: Required hardware for achieving full NexGen Stage 2+ Flex Fuel capability
• 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.