This I Build Race Cars FLX01 Flex Fuel Upgrade Kit is a game - changer for Subaru owners. It fits multiple Subaru models, including the 2007 - 2021 STi, 2008 - 2014 WRX, 2007 - 2012 Legacy GT, 2007 - 2009 Outback XT, and 2009 - 2013 Forester XT. The kit comes with a proprietary controller that generates its own 12V supply for the sensor, reducing wiring and installation time while boosting reliability. It also references the ECU 5V power for accurate data. You get hose assemblies for both the STi and WRX in one kit, and a detachable custom wiring harness for easy troubleshooting. Note that you can only run a maximum of two out of the Secondary Injection Controller, Flex Fuel Sensor, and Fuel Pressure Sensor kits at the same time, unless you make a custom harness. This upgrade is perfect for those with unreliable existing flex - fuel systems or those planning a custom fuel setup. Key features include a replaceable wiring harness with automotive - grade wiring, no need for a 12V supply from the rear O2 sensor, top - down installation, accurate analog output, a durable potted housing, and it requires tuning for flex - fuel operation. The kit includes a Flex Fuel Sensor Controller, a 5 - Pin TGV Plug/Wiring Harness, and mounting hardware. However, it doesn't work with the latest tuning software changes, and the car must be pre - tuned for flex fuel. Also, don't mount the controller directly on the intake manifold and read the instructions carefully before installation.
Using this I Build Race Cars FLX01 Flex Fuel Upgrade Kit is easy. First, make sure your car is one of the compatible Subaru models, like the WRX or STI. Check if your car is already tuned to run flex fuel, as this is a must. When installing, you can do it from the top, so there's no need to crawl under the car. But remember, don't mount the controller directly on the intake manifold. Read the installation instructions thoroughly before you start. You'll find the wiring harness replaceable, which is great if something goes wrong. And since the controller generates its own 12V supply for the sensor, you don't have to worry about getting power from the rear O2 sensor. For maintenance, keep an eye on the wiring harness for any signs of wear. If you need to troubleshoot, the detachable custom wiring harness makes it simple. Just note that you can't run the Secondary Injection Controller, Flex Fuel Sensor, and Fuel Pressure Sensor kits all at once. You can use a maximum of two of them, or make a custom harness if you want to use all three. And if you're just replacing another brand of flex - fuel controller, you probably won't need to retune your car, but always double - check.
