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The COBB NexGen upgrade package listed for 2015–2018 Subaru STI models is a Stage 1 to NexGen Stage 2 plus Flex Fuel power package in blue. It represents COBB's vehicle-specific upgrade path for those model years, packaged to move a Stage 1 setup to NexGen Stage 2 with Flex Fuel capability as described in the product title.
Cobb 15-18 Subaru STI Stage 1 to NexGen Stage 2 + Flex Fuel Power Package Upgrade - Blue
