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- Porsche Cayman GT4 3.8L 2015-16
Fits
Porsche 981 Cayman GT4
Finishing what Porsche started, these fill the void in the 981's underbody. The middle of the vehicle creates drag on automobiles and covering the turbulent areas with flat sheet aluminum reduces this significantly. By improving the airflow to the rear diffuser; the diffuser is able to function better as well.
Produced from sheet aluminum and powder-coated a durable black, they look great and function as intended. Pair this with our rear diffuser to reduce lift and drag simultaneously.
Through CFD, we have estimated the underbody panels reduce the coefficient of drag (cD) by 0.007; or 7 points.
* Will work with other Porsche 981 models, but does take slight modification to mount.*
Kit Includes
• Flat Underbody Pane x 2 (Left and Right)
• Bracket (2)
• Hardware Kit, Includes All Hardware Necessary for Install
Features
Reduce Drag
Increase Fuel Mileage
Improved Diffuser Function
Flat Underbody
Simple to Install
CNC Cut 5052 Aluminum
Powder coated Black for Durability
Produced in the USA
Stainless Steel Hardware Throughout
Rivet-Nut Install Tool Included
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
Fits
Porsche 987 Cayman - 2005 to 2012
Finishing what Porsche started, we fill in the void in the 987's underbody. The middle of the vehicle creates drag on automobiles and covering the turbulent areas with flat sheet aluminum reduces this significantly. By feeding the rear diffuser less turbulent air, we are able to increase the diffuser's ability to create downforce as well.
Produced from sheet aluminum and powder-coated a durable black color, they look great and function as intended. Pair this with our rear diffuser to reduce lift and drag simultaneously.
Through CFD, we have estimated the underbody panels reduce the coefficient of drag (cD) by 0.007; or 7 points.
Kit Includes
• Flat Underbody Panel
• Bracket, 987.1 (2)
• Bracket, 987.2 (2)
• Hardware Kit, Includes All Hardware for Install
Features
Reduce Drag
Increase Fuel Mileage
Improved Diffuser Function
Flat Underbody
Simple to Install
CNC Cut 5052 Aluminum
Powder coated Black for Durability
Produced in the USA
Stainless Steel Hardware Throughout
Rivet-Nut Install Tool Included
Undertrays & Skid Plates |- Critical Protection for Motorsport & Off-Road Driving
Undertrays and skid plates are designed to shield vital vehicle components—such as the engine, transmission, exhaust, and suspension—from impacts, debris, and ground strikes during motorsport and off-road driving. By absorbing and deflecting impacts, these protective panels help prevent costly mechanical damage while allowing confident operation over rough terrain and competitive stages.
Available from Design911, undertrays and skid plates are manufactured from durable materials to deliver maximum protection without compromising performance or airflow.
What Do Undertrays & Skid Plates Do?
Underbody protection components safeguard critical systems and structures.
Core Functions:
- Protect engine, gearbox, and drivetrain components
- Deflect rocks, debris, and ground impacts
- Reduce risk of punctures and mechanical damage
- Maintain vehicle reliability in harsh conditions
- Support safe, aggressive off-road and motorsport driving
They are essential for vehicles exposed to uneven terrain or competitive environments.
Why Do Undertrays & Skid Plates Fail?
Undertrays and skid plates absorb repeated impacts and environmental exposure.
Common Causes of Failure:
- Impact deformation from rocks or obstacles
- Metal fatigue or cracking after repeated strikes
- Mounting point damage or fastener failure
- Corrosion from water, mud, and road salt
- Poor-quality materials or incorrect fitment
Damaged protection can expose critical components to serious risk.
When Should Undertrays & Skid Plates Be Replaced?
Undertrays and skid plates should be replaced when:
- Cracks, bends, or holes are visible
- Mounting points become loose or damaged
- Protection no longer sits flush or secure
- Preparing for more demanding off-road use
- Upgrading to heavier-duty protection systems
Routine inspection and timely replacement maintain vehicle protection and reliability.
Highlights
- Motorsport- and off-road–ready underbody protection
- Shields critical mechanical components
- Durable construction for extreme conditions
- Improves reliability and confidence off-road
