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Porsche > 996 (911) (1997-2005) > 996 C4 3.6L 09/01-2005 > Exterior Styling / Spoilers >

Side Sill Trims / Skirts

Side Sill Trims / Skirts

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DISPLAYING 1 to 9 (of 9 products)
Door sill support. Porsche 996 - 99655162001, 99655161901
7
Door sill support. Porsche 996
Special Order item
9965516
Product Information
Product Information
Door sill support. 

porsche

Fits:
Porsche 996 Carrera 1998-05
Porsche 996 Turbo 2001-05
Porsche 996 GT3 1999-05

Click 'Zoom in' for large parts diagram.
Diagram ref no 1

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Related, superseded, cross reference or alternative numbers for comparison.

9965516
99655162001
99655161901

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Side Sill Corner Piece. Porsche 996 - 9965043930101C, 9965043940101C
7
Side Sill Corner Piece. Porsche 996
Special Order item
99650439
Product Information
Product Information
Side Sill Corner Piece. Satin black.


Fits:
Porsche 996 C2 / C4 1998-05
Porsche 996 GT3 1999-05

Diagram ref no 7



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Related, superseded, cross reference or alternative numbers for comparison.

99650439
9965043930101C
9965043940101C

The product you are viewing cross references to these numbers
Side sill trim / skirt set. Porsche 996 / 996 GT3RS - 99655998403G2X, 99655998303G2X
4
Side sill trim / skirt set. Porsche 996 / 996 GT3RS
99655998X03GRP
Product Information
Product Information
Side sill trims / skirts, for cars after facelift.
The side skirts are made from fiberglass (lightweight part).
Sold as a pair

Fits:
Porsche 996 MK2 C2 / C4 2003 >>
Porsche 996 GT3 RS 2003 >>

Diagram ref no 1

Please note: As most fibre glass panels, this spoiler requires extra work prior to painting in order to ensure satisfying final effect. Gaps between body will need to be filled and dry fitting before painting is recommended.


Note: Image used for illustration purposes only. Specific details, finishes and end fittings may differ from that shown.

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Related, superseded, cross reference or alternative numbers for comparison.

99655998X03GRP
99655998403G2X
99655998303G2X

The product you are viewing cross references to these numbers
Side sill trim / skirt. Porsche 996 / 996 GT3RS - 99655998403G2X, 99655998303G2X
4
Side sill trim / skirt. Porsche 996 / 996 GT3RS
Special Order item
99655998
Product Information
Product Information
Side sill trim / skirt.

porsche

Fits:
For cars with Aerokit Cup (IXAA) and Inner door sill guard, left/right (IX76)
Porsche 996 Carrera 2003>>
Porsche 996 GT3 RS 2003>>

Click 'Zoom in' for large parts diagram.
Diagram ref no 1

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

99655998
99655998403G2X
99655998303G2X

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Side sills GT3 MKII. Porsche 996 >>04
1
Side sills GT3 MKII. Porsche 996 >>04
Special Order item
00004480215
Product Information
Product Information
Specially developed for competition use, the Aerokit MKII side sills are uniquely designed to match the more powerful performance of the latest 911 Carrera. fits all 996 models Coupe/ Targa/Cabrio standard body.

The kit has a piar of side skirts & fitting kit.

Fits:
Porsche 996 >>2004

Material:
Polyuathane PU

Product Type:
Original Porsche
Side Skirt Set Aerokit II Style. Porsche 996 Carrera 2 / Carrera 4 / GT3 - 99655998001, 99655998403 - E470 ABS, E470 CARBON
9
Side Skirt Set Aerokit II Style. Porsche 996 Carrera 2 / Carrera 4 / GT3
E470
Product Information
Product Information

Aerokit II Style Side Skirts - Carbon Fibre or ABS Plastic
Sold as a pair

Give your Porsche 996 the unmistakable factory motorsport appearance with these Aerokit II–style side skirts, engineered to deliver the perfect OE+ upgrade for narrow-body 996 models.

Fits:

  • Porsche 996 C2 3.4L 1997-08/01
  • Porsche 996 C4 3.4L 1997-08/01
  • Porsche 996 C2 3.6L 09/01-2005
  • Porsche 996 C4 3.6L 09/01-2005
  • Porsche 996 GT3 MKI 1999-02
  • Porsche 996 GT3 MKII 2003>>
  • Porsche 996 GT3 RS 2003-04

Developed directly from brand-new OEM Aerokit II components, these side skirts faithfully replicate the original Porsche design language while offering precise and repeatable fitment for both road and track-focused cars. Inspired by the iconic GT3 Aerokit II styling, they enhance the visual profile of the 996 without compromising the clean, timeless proportions of the chassis.

Designed using original Porsche geometry as the benchmark, these skirts integrate seamlessly with factory rocker panels and body lines, creating an authentic OEM+ appearance that feels like it was always part of the car.

This kit is a direct replacement for Porsche part numbers:
• 996 559 980 01 (Left)
• 996 559 984 03 (Right)

Carefully engineered around the Porsche 996 GT3 platform, the side skirts add visual aggression and lower the appearance of the vehicle while maintaining refined factory-inspired styling. Unlike many aftermarket alternatives, the proportions remain true to Porsche’s original Aerokit II design intent.

Each kit includes a complete hardware package for secure installation using factory-style mounting points, ensuring durability and long-term reliability. The skirts can be installed as supplied for a motorsport-inspired finish or professionally painted for a seamless OEM-quality appearance.

Key Features

• Aerokit II style side skirts for Porsche 996
• Inspired by original Porsche GT3 Aerokit II design
• Direct replacement for OEM Aerokit II side skirts
• Designed specifically for narrow-body Porsche 996 models
• OEM+ styling with factory-correct proportions
• Precision-engineered for excellent fitment
• Complete installation hardware included
• Compatible with factory rocker panel geometry
• Suitable for road or track applications
• Can be painted for OEM-style finish

Design Philosophy – OEM+ Styling

The goal behind these Aerokit II side skirts was simple: create the ultimate OE+ side skirt upgrade for the Porsche 996 platform.

Rather than over-styling the car or forcing aggressive aftermarket aesthetics onto the chassis, the design remains faithful to Porsche’s original motorsport styling language.

The result is a subtle yet purposeful enhancement that:
• Adds visual tension and lower body definition
• Improves the side profile without exaggeration
• Retains factory-inspired balance and proportion
• Complements the iconic GT3.2 Aerokit II appearance

Why Upgrade to Aerokit II Style Side Skirts?

For years, Porsche 996 owners wanting the GT3 Aerokit II look had limited options:
• Expensive and difficult-to-source OEM parts
• Poorly fitting aftermarket replicas
• Inconsistent styling and proportions

These side skirts bridge the gap by offering:
• OEM-inspired design accuracy
• Reliable fitment and installation
• Motorsport-inspired aesthetics
• An attainable OE+ styling solution



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

E470
99655998001
99655998403

The product you are viewing cross references to these numbers
Side skirts set. Porsche 911 (996) 1997-2006 - SS911
2
Side skirts set. Porsche 911 (996) 1997-2006
SS911
Product Information
Product Information
Side skirts Set (2 pieces) for Porsche 911 (996) 1997-2006. For variant Coupe / Convertible

fibretek

• Vehicle specific TUV release, thus registration free
• Bonding agent included (may require additional fixings and fitting by experienced bodyshop)
• assembly Instructions
• Side skirts is from high-class material GFK
• Uniform surface structure allows painting without much preparatory work (Product is not painted)
• Material is flexible

Please note: This is a special-order item, can take 8-12 weeks to be delivered and once ordered cannot be cancelled.
Side skirts. Porsche 911 (996) 1997-2006 - HF996RS, ZB072, KOT007, KOT008, ZB072
2
Side skirts. Porsche 911 (996) 1997-2006
SS996
Product Information
Product Information
Side skirts for Porsche 911 (996) 1997-2006

fibretek

For model / body variant (s) Coupe / Convertible,
not suitable for GT2, Turbo and 4S.
in GT / 3 RS look.

Only in combination with add-on parts HSK996RS, SS996RRS, KOT007, KOT008, ZB072, HF996RS.

• Bonding agent included (may require additional fixings and fitting by experienced bodyshop)
&Bull; Side skirt is made of high quality material GRP
&Bull; Uniform surface structure allows painting without much preparation (product is unpainted)
&Bull; Material is flexible
&Bull; Currently no TÜV certificate, therefore individual approval according to §21 StVZO required

Please note: This is a special-order item, can take 8-12 weeks to be delivered and once ordered cannot be cancelled.
Support Bracket for Side Sill Corner Piece. Porsche 996 / 996 GT3 - 99650459300
2
Support Bracket for Side Sill Corner Piece. Porsche 996 / 996 GT3
Special Order item
99650459300
Product Information
Product Information
Support Bracket for Side Sill Corner Piece - fits left or right hand side
Sold each - 2 required per car

Fits:
Porsche 996 1998-05
Porsche 996 GT3 1999-05

Diagram ref no 12




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

99650459300
99650459300

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DISPLAYING 1 to 9 (of 9 products)
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About Side Sill Trims / Skirts

Porsche Side Sill Trims & Skirts | Aerodynamic Design with Style and Function

Side sill trims and skirts are essential components of your Porsche’s exterior design, providing both aerodynamic efficiency and a refined, sporty look. These panels streamline airflow along the vehicle’s sides, reduce drag, and enhance stability at higher speeds — all while protecting the lower bodywork from debris and road wear.

At Design911, we supply a wide range of high-quality side sill trims and skirts made from lightweight materials such as carbon fibre, fiberglass, and reinforced composites. Precision-moulded for perfect fitment, these components deliver superior durability and finish — whether you’re refreshing worn trims, upgrading for a sportier stance, or completing a full body conversion.

From classic 911 models to modern Cayman, Boxster, and Taycan variants, our side skirts combine performance styling with lasting protection, offering the ideal solution for enthusiasts seeking motorsport-inspired design with everyday practicality.

What Do Side Sill Trims and Skirts Do?

Side sill trims and skirts improve the aerodynamic profile of your Porsche while adding visual balance to the car’s exterior.

Core Functions:
Direct airflow along the car’s sides to reduce drag and turbulence.
Enhance aerodynamic efficiency and improve vehicle stability.
Protect lower body panels from stones, mud, and debris.
Visually lower the vehicle’s profile for a sportier, more aggressive stance.
Complement front and rear spoilers for a cohesive aerodynamic setup.

Properly fitted side skirts can reduce lift, increase stability, and add a distinctive, performance-oriented character to your Porsche.

Why Do Side Sill Trims and Skirts Fail or Degrade?

While designed for durability, side trims are constantly exposed to environmental and physical stresses that can cause wear or damage over time.

Common Causes of Failure Include:

  • Impact damage from curbs or road debris.
  • Cracking or chipping from age or stress.
  • UV exposure leading to discoloration or fading.
  • Corrosion or fatigue in mounting points or fasteners.
  • Improper installation causing misalignment or vibration.

Damaged side skirts can disrupt airflow, reduce aerodynamic efficiency, and detract from your Porsche’s clean, streamlined appearance — making repair or replacement essential for performance and aesthetics.

Why Replace or Upgrade Your Porsche Side Sill Trims or Skirts?

Upgrading or replacing your Porsche’s side sill trims restores both aerodynamic balance and design integrity, ensuring your vehicle performs and looks its best.

Key Benefits:

  • Improves aerodynamic stability and efficiency.
  • Protects lower panels from dirt and impact damage.
  • Enhances the visual profile with a performance-inspired look.
  • Lightweight construction for better performance.
  • Precision fitment for easy installation and secure mounting.
  • Available in various finishes — gloss black, carbon fibre, or body-coloured.

Ideal for both track-focused builds and street-driven upgrades, these parts provide the perfect combination of functionality, performance, and style.

Highlights:

  • Premium Porsche side sill trims and skirts.
  • Aerodynamically tested designs for improved stability.
  • Durable materials like carbon fibre and composite blends.
  • Direct-fit replacements for Porsche 911, Cayman, Boxster, Taycan and more.
  • Restores protection and enhances styling. Perfect for performance or restoration projects.

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