Torque Solution -6AN Flex Fuel Add-On Kit - 02-14 Subaru WRX - 07-20 Subaru STI - TS-SU-6FLK-FFUTorque Solution 6AN Flex Fuel Add On Kit Description: Torque Solution 6an Flex Fuel Add On Kit is a DIY kit, which allows you to easily tie in your Cobb Flex Fuel Kit with your existing Torque Solution or custom upgraded fuel line system. This kit is a must if you are running aftermarket rails and FPR, as the Cobb kit is only designed to integrate with the OEM rails and fuel lines. You also get the flexibility to place the sensor anywhere to your