• Fits 2012-2014 Subaru WRX & STI
  • All necessary mounting hardware included
  • Compatible with most exhaust systems
  • 20 Minute installation
  • Built from Aircraft-grade Aluminum and Powdercoated Satin Black
  • Weighs only 16LBS (8KG)
  • Built strong and durable to handle curb rash and track abuse like a champ!
  • Highest quality diffuser on the market for Subaru WRX and STI!


Diffuser body is flush with the rear of the car and is designed specifically to match the rear bumper of the GV WRX and STI. The Railer (Jr.) is engineered to reduce lift (thus increasing downforce) on the rear end of your car by directing high pressure air to a low pressure environment (behind your car). All 5 fins extend the full length of the Diffuser to immediately start channeling air from underneath your car under your exhaust and straight out the rear of the car. The diffuser is mounted to the rear of the control arms and to the exhaust hangers using all-included brackets and hardware designed specifically for this diffuser. The rear brackets attached to your exhaus hanger are suspended with dense rubber grommets to prevent any vibration

5-Element Railer (Jr.) Rear Diffuser for Subaru WRX & STI

Color: Satin Black Powdercoat
  • Weight: 16 LBS

    Cutting/Drilling Required: None

    Compatibility: 2012-2014 (GV) Subaru WRX and STI Sedans. Will not fit Hatchbacks!

    Description: Give your WRX that up to date look with our aggressive 5-Element Railer (Jr.) Rear Diffuser! It's street friendly and the body of the diffuser extends all the way up to the rear frame. 


Phone: (423) 834-5020


Mon - Fri: 11AM-5PM EST


We'll give you the best customer service in the industry! For questions about our products, just call, text or email and we'll get back to you within 1 Business Day!


We design high-quality, durable aerodynamic products and manufacture all of our products from aircraft-grade aluminum, then they're powder coated or wrapped for a premium build that is more robust and will endure a longer life than products from our competition!


All of our products are engineered and manufactured in the United States! We strive to maintain the best quality product on the market!

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