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Porsche > 911 & 912 (1965-1989) > 911 1974-1977 2.7L / 1976-77 3.0 Carrera > Chassis / Bodywork > Bumpers Rear >

Lower spoiler / Diffuser / Valance

Lower spoiler / Diffuser / Valance

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DISPLAYING 1 to 4 (of 4 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Related, superseded, cross reference or alternative numbers for comparison.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Related, superseded, cross reference or alternative numbers for comparison.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.

dansk

Fits:
Porsche 911 1974-89

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.

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
91150517108
91150517101

The product you are viewing cross references to these numbers
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.

oematch

Fits:
Porsche 911 1974-89

Click 'Zoom in'  for large parts diagram.
Diagram ref no 21

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 4 (of 4 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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