Carbon Rear Diffuser - Porsche 981 Cayman

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Carbon Rear Diffuser - Porsche 981 Cayman

Rear diffusers are extremely efficient downforce producing devices when designed properly. We set out to produce a functional rear diffuser for the Porsche 981 GT4 using state of the art R&D processes. The assembly blends function and form utilizing carbon fiber, sheet metal, and hard rubber.

Utilizing scan data, CAD, and ANSYS Fluent analysis software; we were able to design and produce a functional and aesthetically pleasing rear diffuser for this Porsche chassis.

The three main diffuser planes are produced from 2x2 twill, autoclave cured, carbon fiber; while the strakes are manufactured from durable polyurethane for longevity.

The entire unit bolts to chassis locations through multiple sheet metal brackets. There is absolutely no drilling or fabrication required for installing this rear diffuser.

* Outside stakes require slight trimming if installing with OEM GT4 muffler*


  • Diffuser Main Plane, Left-Hand
  • Diffuser Main Plane, Center
  • Diffuser Main Plane, Right-Hand
  • Bracket (4)
  • Strake, Hard Rubber (4)
  • Hardware Kit, Includes All Hardware Necessary for Install


  • Improved Vehicle Performance, Both with Increase in Downforce and Reduction In Drag
  • Analyzed with ANSYS Fluent to Improve Performance Given Build Volume
  • Flows with the Factory Bumper Lines
  • Durable and Replaceable Strake Design for Improved Longevity
  • Modular Design - Able to add on Flat Underbody Cover for Improved Performance


  • 2x2 Twill, Autoclave Cured, 1.5mm Thick Carbon Fiber Construction
  • Lightweight Bonded Carbon Strengthening Sections on Top of Diffuser Main Planes for a Rigid Main Plane
  • Durable and Replaceable Strake Design
  • CNC Laser and Bent 5052 Aluminum Brackets
  • Stainless Hardware Throughout
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