Flow Designs

Flow Designs Rear Diffuser

2015+ WRX / 2015+ STI

Ships for free in the 48 states
Make the rear end of either your 2015+ WRX or STI better looking and more aggressive with the Flow Designs Rear Diffuser! NOTE: Optional Rear Diffuser Extension can be seen in some of these pictures, but it is an OPTION.
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Flow Designs Rear Diffuser

With over 30 years of accumulative knowledge of design, manufacturing, mechanical and automotive experience, Flow Designs strives to bring fresh and innovative ideas to this industry, by exploring new manufacturing processes and recycled materials to become market leaders.

Most people start with a nice front lip and then add some other components like side skirts / splitters. This Flow Designs Rear Diffuser goes well with their other offerings and can help you complete your look.

Why do Flow Design use Polyethylene Composite for Flow Designs Splitters?

Strong, impact resistant, doesn't corrode or chip, and has excellent abrasion resistance (say… from scraping on driveways and road all the time?)

Carbon Fiber is better isn’t it?

As strong and light as Carbon fiber is, it CRACKS on impact or when under load and/or stress. Clear coat will eventually fades & cracks and become undesirable.

Kit Includes
  • Adjustable rear diffuser
  • Pair of chassis mounts
  • Center support bracket
  • Mounting hardware
  • 2 Flow Designs Stickers
  • Fitting kit
  • 10mm thick polyethylene composite
  • Bevelled edges
  • Hand polished satin black
Shown With Optional Extension

Optional Items


This extension is a breeze to add to your Flow Designs rear diffuser if you already have one installed. Make the look just a little more aggressive with this rear diffuser extension.

Kit Includes
  • Rear diffuser extension
  • 2 Flow Designs Stickers
  • Fitting kit


  • 4.5mm Scratch-resistant ABS
  • Bevelled edges


  • Textured Satin Black
  • Scratch-resistant

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