Undertrays Chassis & Engine

Centre Undertray.
Restore the under-body protection and aerodynamic integrity of your Porsche with this genuine centre undertray. Designed for models such as the 911 (997) & Boxster/Cayman (987) 2005-13, this under-body panel covers the mid-section underside of the vehicle, providing enhanced acoustic suppression, improved airflow and vital protection for under-car components.

Fits:

• Porsche Boxster 987 2.7L 2005 -08/08
• Porsche Boxster 987 S 3.2/3.4L 2005-08/08
• Porsche Boxster 987 MKII 2.9L 2009-2012
• Porsche Boxster S 987 MKII 3.4L 2009-2012
• 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
• Porsche 997 MK1 Carrera 2 3.6L 2005-08
• Porsche 997 MK1 Carrera 2S 3.8L 2005-08
• Porsche 997 MK1 Carrera 4 3.6L 2005-08
• Porsche 997 MK1 Carrera 4S 3.8L 2005-08
• Porsche 997 MK1 TURBO 2007-09
• Porsche 997 MK1 GT3 2007-09
• Porsche 997 MK1 GT2 2007-09
• Porsche 997 MKII Carrera C2 3.6L 2009-12
• Porsche 997 MKII Carrera C4 3.6L 2009-12
• Porsche 997 MKII Carrera C2S 3.8L 2009-12
• Porsche 997 MKII Carrera C4S 3.8L 2009-12
• Porsche 997 MKII GT3 2010-11
• Porsche 997 MKII Turbo 2010-13
• Porsche 997 MKII GT2 RS 2011-13

Diagram Ref No 3

What This Product Does:

• The centre undertray (or belly pan) is a large panel mounted underneath the vehicle, typically in the under-body centre section. Its functions include:
• Noise/Vibration/Harshness) reduction: by covering the underbody it helps reduce road noise and wind noise in the cabin.
  
• Aerodynamic improvement and underbody protection: providing a smoother underside, it helps reduce drag and aids airflow beneath the vehicle.
  
• Protection of vital components: the undertray shields components on the underside from road debris, water spray, and minor impacts (curbs, debris) that might otherwise damage suspension, exhaust, plumbing.
  
• In effect, it is a functional body-panel that sits beneath the car’s mid/centre section, helping the car perform better, stay quieter and better protected.

Symptoms & Signs You May Need Replacement:

• Visible damage, cracks, missing sections or broken fasteners — due to scuffs against curbs, underbody impacts, or age-related degradation.
  
• Underbody noise increase or vibration — if the undertray is loose, missing or damaged the underbody acoustic performance may suffer.
  
• Increased drag or wind noise — if the panel is warped or detached in spots, you may notice more wind howl or lowered top-speed performance (especially in performance cars).
  
• Exposure of components — if you see components normally covered (e.g., plumbing, wiring, underside of the engine/transmission) then the undertray may be missing or removed.
  
  

Why Replacement Matters:

• Improves drivability & comfort: A sound underbody panel improves the feel inside the cabin, reducing wind/road noise and helping the car feel more refined.
  
• Maintains aerodynamic efficiency: Especially on high-performance Porsche models, having the underbody panel in place helps maintain the designed airflow and downforce characteristics.
  
• Protects underbody equipment: Without the undertray you risk stone strikes, water spray and debris hitting vulnerable components (fuel lines, oil lines, exhaust) directly.
  
• Avoids costly damage: A thrown stone or curb contact could damage a part that otherwise the undertray shielded; replacing soon means fewer downstream issues.

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

99750404300

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Front undertray cover.

Fits:
Porsche 997.1 C2 2005-08
Porsche 997.2 C2 2009-12
Porsche 997 GT2 2007-13 *LHD cars only
Porsche 997 GT3 2007-11 *LHD cars only
Porsche 987.1 Boxster 2005-08
Porsche 987.2 Boxster 2009-12
Porsche 987C.1 Cayman 2006-08
Porsche 987C.2 Cayman 2009-12

Diagram ref no 1

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

99750452702

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Plastic Expansion rivet / trim clip

This Expansion Rivet is an OE Match fastening clip manufactured to replicate the original Porsche specification for fit, function, and durability. This push-fit plastic rivet is widely used throughout Porsche vehicles to secure lightweight components such as bumper covers, wheel arch liners, undertrays, and trim panels.

Widely used across multiple Porsche model ranges, including:
Porsche 911 (964, 993, 996, 997, 991)
Porsche Boxster & Cayman (986, 987, 981, 982)
Porsche Cayenne (955, 957)
Porsche Panamera (970)

Common applications include:
Bumper covers
Wheel arch liners
Undertrays and splash shields
Side skirts and trim panels

Ideal for both maintenance and restoration work, this OE Match rivet helps maintain factory-correct panel alignment and prevents movement, vibration, or detachment of essential trim components.

This expansion rivet provides a secure fixing point for various body and trim elements. It locks components into place by expanding within the mounting hole, ensuring panels remain properly aligned and firmly attached.

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

99959194140

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Rear Support Bracket.

The Genuine Porsche Rear Support Bracket (Part Number: 98750457100) is an original equipment underbody mounting component designed for selected Porsche Boxster (987) and Porsche Cayman (987C) models.
Sold Each.
x2 Required Per Car.

Fits:

• Porsche Boxster 987 2.7L 2005-08/08
• Porsche Boxster 987 S 3.2/3.4L 2005-08/08
• Porsche Boxster 987 MKII 2.9L 2009-12
• Porsche Boxster S 987 MKII 3.4L 2009-12
• 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  

Diagram Ref No 7

Also referred to as a Rear Underbody Support Bracket, Rear Floor Pan Support or Rear Underbody Cover Bracket, this component forms part of the vehicle's protective underbody covering assembly.

Its primary function is to provide a secure mounting and supporting point for the rear underbody cover, helping maintain the correct position and attachment of the panel beneath the vehicle.

The Porsche 987 Boxster and Cayman feature a series of underbody protection panels designed to shield components from road debris, water, dirt and other environmental contamination.

These panels also contribute to the vehicle's original underside configuration, helping maintain a smooth and properly assembled underbody surface.

The rear support bracket works alongside the underbody cover, mounting fasteners and associated retaining hardware to hold the relevant panel in its intended position.

Manufactured to Porsche's original equipment specifications, the bracket is designed to match the mounting arrangement of compatible vehicles.

Correct installation helps maintain panel alignment and reduces unwanted movement, vibration or rattling during driving.

The bracket is exposed to moisture, road salt, vibration and debris thrown up from the road surface.

Over time, it may become bent, corroded, cracked or damaged, particularly following contact with road obstacles, kerbs or incorrectly positioned lifting equipment.

A damaged or missing bracket may allow the rear underbody cover to become loose, creating unwanted noise or leaving the protective panel inadequately supported.

Replacing a worn or damaged bracket with a Genuine Porsche component helps restore the original underbody mounting arrangement and maintain secure attachment of the surrounding protective panels.

What This Product Does:
The rear support bracket is a mechanical mounting component within the underbody protection assembly.

Its primary function is to provide the specified attachment and support point for the rear underbody cover.

The underbody covering is made up of several panels secured using retaining brackets, screws, clips and nuts.

These components must be correctly installed to prevent the covers from shifting or vibrating while the vehicle is in motion.

The rear support bracket helps maintain the position of the protective panel and provides a reliable mounting interface.

Its main functions include:

• Supporting the rear underbody cover: Helps hold the protective panel in its intended position.
• Maintaining secure panel attachment: Provides a mounting interface for the associated underbody covering.
• Reducing unwanted movement: Helps prevent the rear underbody panel from shifting during driving.
• Maintaining correct alignment: Supports the original positioning of the underbody protection components.
• Reducing rattling and vibration: Helps prevent unwanted noise from an inadequately secured cover.
• Supporting underbody protection: Keeps the relevant protective panel correctly mounted.
• Maintaining original underbody construction: Preserves Porsche's factory fastening arrangement.
• Supporting correct panel clearance: Helps maintain the intended spacing between the cover and surrounding components.
• Facilitating underbody repairs: Allows damaged retaining hardware to be replaced independently.
• Supporting vehicle restoration: Helps restore missing or damaged original mounting components.

Symptoms Of Wear Or Failure:
The rear support bracket does not contain moving mechanical parts.

Deterioration generally occurs through corrosion, impact damage, incorrect installation or repeated removal during servicing.

Common signs of wear or failure include:

• Loose rear underbody cover: The protective panel may no longer remain securely attached.
• Rattling noises beneath the vehicle: An insecure mounting point may allow the cover to vibrate.
• Visible corrosion: Rust may develop after prolonged exposure to moisture and road salt.
• Bent bracket: Impact damage may distort the original mounting shape.
• Cracked bracket: Mechanical stress may cause fractures around the component or fastening points.
• Damaged mounting holes: Elongated or distorted mounting holes may prevent secure attachment.
• Missing bracket: Previous underbody repairs may have left the original support component absent.
• Partially detached underbody panel: A damaged bracket may allow the protective cover to drop away from its normal position.
• Uneven panel alignment: The rear underbody cover may no longer sit correctly against adjoining panels.
• Scraping or contact noises: A loose cover may make contact with the road or neighbouring components.
• Excessive panel movement: The cover may move when inspected by hand.
• Damaged retaining hardware: Corroded or missing nuts and screws may affect the bracket's attachment.
• Visible impact damage: Contact with speed bumps or road obstacles may deform the bracket.
• Poor fitment after servicing: Incorrect reassembly may leave the bracket misaligned.
• Damage around the mounting points: Cracked surrounding panels or damaged fixings may indicate an insecure support arrangement.

Why Replacement Matters:
Replacing a damaged rear support bracket helps maintain the correct installation of the Porsche Boxster or Cayman rear underbody protection panel.

A corroded, bent or cracked bracket may no longer provide adequate attachment for the underbody cover.

Continued driving with a loose cover may result in additional vibration, damaged mounting points or contact with surrounding components.

In severe cases, an inadequately secured underbody panel may partially detach.

Installing a Genuine Porsche replacement Rear Support Bracket helps to:

• Restore secure underbody cover attachment: Replace damaged or missing support hardware.
• Maintain original panel positioning: Help ensure the protective cover fits correctly.
• Reduce rattling and vibration: Address unwanted movement caused by a defective mounting bracket.
• Prevent further panel damage: Restore support before additional mounting points deteriorate.
• Maintain underbody protection: Keep the protective panel securely positioned.
• Replace corroded components: Renew brackets affected by moisture and road salt.
• Support correct panel alignment: Restore the intended fastening arrangement.
• Reduce the risk of panel detachment: Address insecure underbody mounting points.
• Support bodywork refurbishment: Replace damaged components during underside repairs.
• Maintain original Porsche construction: Preserve the factory-designed underbody assembly.
• Avoid unsuitable mounting modifications: Use the specified Porsche component rather than improvised brackets.
• Support long-term vehicle maintenance: Keep the underbody protection system properly assembled.
• Maintain Genuine Porsche quality: Use original equipment replacement hardware.

Replacement is recommended when the bracket is cracked, severely corroded, distorted, missing or unable to secure the underbody cover correctly.

If the protective cover or its mounting points are also damaged, those components may require separate replacement.

Related reference numbers
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98750457100

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Side Sill Corner Piece. Satin black.

Fits:
Porsche 987 Boxster - 2005 to 2012
Porsche 987 Cayman - 2006 to 2012

Diagram ref no 10

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98750479

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Tapping Screw. Black-coated tapping screw. Multiple applications, often used for exterior accessories such as side skirts or underbody protective coverings. Torx-head - 4.8 x 16mm

Fits:
Porsche Boxster
Porsche Cayman
Porsche 996
Porsche 997




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