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Lower spoiler / Diffuser / Valance
This is a top quality aftermarket part.
Fits:
Porsche 718 Cayman GT4 2017 - 2021
Porsche 718 Boxster Spyder 2017 - 2021
Top quality aftermarket rear diffuser designed to enhance the rear styling and aerodynamic appearance of the vehicle. Manufactured with a precise fit and durable finish, this diffuser gives the rear bumper a sportier, more aggressive look while maintaining a clean OEM-style fitment.
Finished in matte black, it is ideal for upgrading or replacing the original rear diffuser. Supplied with sensor brackets for a practical installation, and designed to be used with the original tail pipe setup.
Key features:
• Top quality aftermarket part
• Matte black finish
• Sporty rear-end styling upgrade
• Designed for accurate fitment
• Supplied with 4 sensor brackets
• Compatible with original tail pipes
• Ideal for replacement or exterior styling upgrade
Please note: if not in stock, Delivery time is normally 6-8 weeks.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
981898307A
The product you are viewing cross references to these numbers
- Porsche Boxster Spyder / Spyder RS 718 4.0L 01/2019>>
- Porsche Cayman GT4 718 4.0L / GT4 RS 718 4.0L
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12 Month Warranty
Worldwide Delivery
Enhance both the performance and aesthetics of your Porsche with rear bumper lower spoilers, diffusers, and valances from Design911. These aerodynamic components are engineered to optimise airflow, increase stability, and refine your vehicle’s rear-end styling. Whether you’re upgrading for track performance or restoring factory bodywork, each part is crafted to OEM specifications for perfect fitment and durability. Choose from factory replacement panels, lightweight performance diffusers, or custom valances to achieve the look and function your Porsche deserves. From classic air-cooled models to the latest sports variants, Design911 provides precision-built aerodynamic parts trusted by Porsche owners worldwide.
Rear Diffusers
Aerodynamic Porsche diffusers designed to improve underbody
airflow, reduce drag, and enhance rear-end downforce. Available in OEM and
performance-grade materials.
Lower Rear Spoilers & Lips
Subtle yet effective spoilers that reduce turbulence and
improve stability at high speeds. Designed for a seamless factory fit and
refined Porsche styling.
Rear Valance Panels
Replacement and performance rear valances that complete the
bumper assembly, adding structure and style while maintaining aerodynamic
efficiency.
Classic Porsche Lower Trims
Authentic reproduction rear valances and diffusers for
classic models such as the 911, 964, and 930 Turbo — ideal for concours
restorations.
Carbon Fibre & Lightweight Aero Parts
High-performance lightweight carbon fibre or composite aero
parts designed for motorsport applications and modern Porsche performance
builds.
Mounting Brackets & Fitting Accessories
OEM-quality brackets, fasteners, and hardware for easy
installation of Porsche diffusers and valance panels, ensuring secure fitment
and factory alignment.
Monday-Friday: 8.30am - 5.30pm (GMT)
Saturday: Closed
Sunday: Closed