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Porsche > 911 & 912 (1965-1989) > 911 1978-1983 3.0L / SC > Chassis / Bodywork > Bumpers Rear >

Lower spoiler / Diffuser / Valance

Lower spoiler / Diffuser / Valance

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DISPLAYING 1 to 5 (of 5 products)
Rear bumper lower panel. Porsche 911 08/1973-89 - 91150517101, 1680600300, 91150517108GRV, 91150517108 - 1680600300
5
Rear bumper lower panel. Porsche 911 08/1973-89
91150517108GRV/1
Product Information
Product Information
Rear Bumper Lower panel. For Impact bumper cars G- model. For cars with single outlet exhaust.

dansk

Fits:
Porsche 911 3.2L 08/1983-07/1989
Porsche 911 (not OE look) 2.7-3.0 08/1973-07/1983

Click 'Zoom in' for large parts diagram.
Diagram ref no 2

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

91150517108GRV
91150517101
1680600300
91150517108GRV
91150517108

The product you are viewing cross references to these numbers
Rear bumper lower valance CUT for twin outlet exhaust. Porsche 911 1974-89 - 91150517108GRV, 591096-1, 1680601300, 91150517108, 91150517101 - 1680601300
3
Rear bumper lower valance CUT for twin outlet exhaust. Porsche 911 1974-89
91150517108GRV/2
Product Information
Product Information
Rear Bumper Lower Valance CUT for Twin outlet Exhaust . Porsche 911 1974-89 impact bumper cars.

dansk

Fits:
Porsche 911 1974-89

Click 'Zoom in' for large parts diagram.
Diagram ref no 30

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

91150517108GRV
91150517108GRV
591096-1
1680601300
91150517108
91150517101

The product you are viewing cross references to these numbers
Rear bumper lower valance without cut side exhaust cut-out fibreglass. Porsche 911 1974-89 - 91150517108GRV, 91150517108, 91150517101 - 1680603800
4
Rear bumper lower valance without cut side exhaust cut-out fibreglass. Porsche 911 1974-89
91150517108GRV/3
Product Information
Product Information
Rear bumper lower valance fibreglass. Porsche 911 1974-89 impact bumper cars.

Fits:
Porsche 911 1974 - 1989

Diagram ref no 2

This gel-coat fiberglass lower panel can be used with "GT3 style" center outlet exhausts like JP: 1620614300, 1620614200, 1620802210, 1620802410 or any other type of alternative exhaust setup. 

Cut out template is included for dual center exhaust.

Please Note: 
Installation of this part must be done by persons with matching skills, since measuring, precision cutting and drilling is necessary to obtain a satisfying result.
Make sure to test fit prior to painting.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

91150517108GRV
91150517108GRV
91150517108
91150517101

The product you are viewing cross references to these numbers
Rear valance for custom exhaust solutions. Porsche 911 SC / Carrera - TK303
1
Rear valance for custom exhaust solutions. Porsche 911 SC / Carrera
TK303
Product Information
Product Information
Rear valance for custom exhaust solutions.
Covers both bumper corners and closes the factory outlet.

fibretek

Fits all 911 SC / Carrera models.
Valance fixing clamps. Porsche 911 1974-89 - 91150302300
2
Valance fixing clamps. Porsche 911 1974-89
91150302300/1
Product Information
Product Information
Valance Fixing Clamps.
The OE Match Valance Fixing Clamps are high-quality replacement body fastening components designed to securely retain the front or rear valance panel to the vehicle body. Manufactured to OE specifications for fit, strength and durability, these clamps provide reliable attachment while maintaining correct panel alignment and appearance.  

Fits:
  • Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
  • Porsche 911 1978-1983 3.0L / SC
  • Porsche 911 1984-1986 3.2L
  • Porsche 911 1987-1989 3.2L G50
  • Porsche 911 1975-1977 3.0L Turbo (930)
  • Porsche 911 1978-1989 3.3L Turbo (930)  

Diagram Ref No 21

Constructed from durable automotive-grade materials, the fixing clamps are engineered to withstand vibration, weather exposure, road debris and repeated maintenance procedures. They play an important role in ensuring the valance remains securely mounted while helping preserve the original fit and finish of the vehicle's bodywork.  

What This Product Does:
  • Secures the valance panel to the vehicle body.
  • Maintains correct body panel alignment.
  • Prevents movement and vibration of the valance assembly.
  • Helps preserve the original appearance of the vehicle.
  • Supports secure installation of front or rear body trim components.
  • Reduces the risk of panel rattles and looseness.
  • Contributes to overall bodywork integrity and stability.

Symptoms Of Wear Or Failure:
  • Loose or poorly aligned valance panels.
  • Rattling noises from body panels while driving.
  • Visible gaps between the valance and bodywork.
  • Valance movement when touched or during vehicle operation.
  • Broken, cracked or missing retaining clips.
  • Difficulty securing the valance during installation.
  • Premature wear of mounting points.
  • Reduced body panel stability and appearance.

Why Replacement Matters:

  • Valance fixing clamps are exposed to continual vibration, road debris, moisture, temperature fluctuations and general ageing. Over time, clips can become brittle, corroded, damaged or lose their retention strength, reducing their ability to securely hold body panels in place.
  • A damaged or missing fixing clamp can allow the valance to move excessively, creating rattles, poor panel fitment and potential damage to surrounding bodywork. In severe cases, unsecured panels may become detached during driving, compromising both appearance and safety.
  • Replacing worn or damaged valance fixing clamps restores secure panel retention, maintains factory-correct alignment and helps preserve the integrity of the vehicle's bodywork. OE Match replacement clamps provide factory-style fitment, dependable durability and long-term reliability, making them ideal for restoration, maintenance and bodywork repairs on your Porsche.



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

91150302300
91150302300

The product you are viewing cross references to these numbers
DISPLAYING 1 to 5 (of 5 products)
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About Lower spoiler / Diffuser / Valance

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.

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