Carbon Rear Diffuser – Porsche 981 Cayman


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Ships direct from Verus Engineering.
Up to 1 week lead time for items to ship.

Ships from Manufacturer

SKU: VE-A0150A Category:



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 2×2 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.


  • 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

Modular Design – Able to add on Flat Underbody Cover for Improved Performance


2×2 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


The rear diffuser and undertray were designed to tie together the rear aerodynamic package of the 987 Cayman. Coupled with our Front Dive Plane Kit, this creates our Ventus 1 kit and creates a solid bump in downforce with minimal drag increase. The design maximized the area under the car to hit specific performance goals while being aesthetically pleasing.

In the Ventus 2 kit, coupled with our front splitter and rear wing; a significant increase in downforce is achieved.

Install Video

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Verus Engineering ships via FedEx and USPS, both domestically and internationally. Estimated delivery times for domestic FedEx shipments are explained in above image.


Verus Engineering sends an email with tracking number for every order placed with a valid email address. Tracking is sent *to the email used during checkout* directly via the carriers. Please check your spam folders and/or your email specifically used during checkout.


If an address needs to be changed or updated, there will be a minimum charge of $10. This takes Verus time and resources to make the appropriate changes. We cannot guarentee that the address change will take place correctly but will do our best to facilitate it.


Due to the nature of our business and the use of our parts, all of our products have a 1-year limited manufacturer defects warranty. If you have any questions regarding a warranty issue please do not hesitate to give us a call or shoot us a quick email.


All parts manufactured and sold under the Verus Engineering name are designed and manufactured with the intent to increase vehicle off-road performance and are not intended for use on public streets. Due to the nature of racing, all variances in conditions and use cannot be foreseen and therefore the safety of any person associated with use of our products is out of our control and we cannot be held liable for said event or any product failures due to unforeseen events or improper use or abuse when using products manufactured or sold by Verus Engineering.
Modification of any vehicle by installing parts manufactured by Verus Engineering could alter the vehicle’s on-road performance in the event of a crash, resulting in bodily harm or property damage. In purchasing any item from Verus Engineering, the purchaser hereby assumes full responsibility for any property damage or personal injury that may occur while using products manufactured and sold by Verus Engineering. Verus Engineering will not take responsibility for personal injury or property damage arising from usage or failure of parts manufactured and/or sold by Verus Engineering.
Do not purchase or install any part manufactured or sold by Verus Engineering if you do not agree with the above terms, and that you do not feel competent in installing safely and correctly. Improper installation or manufacturing procedures of DIY components can lead to personal injury or death, or property damage; a qualified professional should install all products, only skilled individuals should complete all DIY parts. Verus Engineering reserves the right to change pricing, material specifications, or any other specifications associated with their products without prior notification.


Additional information

Weight15 lbs
Dimensions42 × 36 × 4 in


Verus Engineering


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