JDM STI Front Flexible Draw Stiffener Install | 2015–2021 Subaru WRX ST

In this video, I install the Subaru JDM STI Front Flexible Draw Stiffener on my 2021 Subaru WRX STI Limited in World Rally Blue as part of my ongoing OEM+ chassis upgrade series. This genuine STI performance component is designed to apply controlled tension between the vehicle body and crossmember, helping reduce chassis flex under load. The result is sharper steering response, improved cornering stability, and more consistent grip across all four wheels, while maintaining ride comfort. I walk through the full step-by-step installation process, including mounting locations, hardware installation, and how the component integrates into the STI chassis reinforcement system. 🔧 What This Video Covers • Overview of the STI Front Flexible Draw Stiffener • Mounting points and installation process • How the stiffener improves chassis rigidity • Relationship to other STI chassis components • Final thoughts on OEM+ chassis upgrades 🚗 Vehicle Compatibility Fits VA chassis Subaru WRX STI models: • 2015 Subaru WRX STI • 2016 Subaru WRX STI • 2017 Subaru WRX STI • 2018 Subaru WRX STI • 2019 Subaru WRX STI • 2020 Subaru WRX STI • 2021 Subaru WRX STI Installed on my 2021 WRX STI Limited (World Rally Blue). ⚙️ About the STI Flexible Draw Stiffener The STI Flexible Draw Stiffener is part of Subaru Tecnica International’s Original Sports Performance lineup. It works by applying moderate tension between the chassis and front crossmember, helping prevent the body from flexing under cornering loads. This contributes to: • Faster and more responsive steering input • Improved cornering stability • Better overall chassis rigidity • More consistent tire contact with the road For best results, STI designed this component to work alongside other parts such as the STI Flexible Tower Bar. This video is part of my WRX STI OEM+ build series, where I’m upgrading the car with genuine STI performance components to improve handling while maintaining factory refinement. 👍 If you enjoy Subaru WRX STI DIY installs and OEM+ builds, consider liking the video and subscribing for more.