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Your Vehicle  //  Porsche  //  991 (911) MK2 2016-2019  //  991.2 Speedster 4.0L (510Bhp) 2019

Duct Spoiler & Air Scoop

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Special Order item
99157511
Product Information
Product Information

This Porsche input-shaft air guide is the air duct and belongs to the assembly containing the cross member and side parts.

Fits

  • Porsche 991.1 R 4.0L 2016
  • Porsche 991.1 GT3 2014-2016  
  • Porsche 991.2 GT3 2017–19
  • Porsche 991.2 GT2 RS 2018–19

    Diagram ref no: 40 (both sides)


What This Product Does

The duct guides air along the route provided around the input shaft. It forms part of the surrounding cross-member arrangement, rather than being a transmission shaft or a complete undertray. Its location and attachment must correspond to the vehicle's original assembly.

Functions

  • Channels airflow around the input shaft.
  • Completes the original air-guiding arrangement.
  • Provides a replacement for an absent or damaged duct.

    Technical Details
  • Brand: Porsche; genuine part.
  • Exploded-diagram description: Air guide Input shaft.
  • Component type: air duct; position: Left/Right.
  • Quantity: 1.
  • Assembly: Cross member

    Symptoms of Fault
  • Cracking, deformation or other visible impact marks.
  • Damaged attachment points preventing secure positioning.
  • Rattling associated with a duct that has become loose.
  • An incomplete air path where the guide is absent.
  • Contact marks indicating rubbing against nearby components.

    Why Replacement Matters

Renewing an unserviceable guide reinstates the factory duct layout. Check adjacent rear-axle components, mounting locations and fixings during installation: damage elsewhere may prevent the replacement from sitting correctly. Secure positioning helps avoid unwanted contact and vibration.

FAQs

How should compatibility be confirmed?
Match part to the vehicle's VIN, derivative and original assembly. Check fitment for your specific vehicle (model, year, engine) before ordering.



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Related, superseded, cross reference or alternative numbers for comparison.

99157511
99157511881
99157511781

The product you are viewing cross references to these numbers
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About Duct Spoiler & Air Scoop

Porsche Duct Spoiler & Air Scoop

At Design911, we supply a specialist range of duct spoilers and air scoops for Porsche models, designed to manage airflow around brakes, radiators and the underbody so your car can cope more confidently with demanding road and track use.

Why do Porsche Duct Spoiler & Air Scoop components matter?

Duct spoilers and air scoops help guide cooling air exactly where your Porsche needs it – typically towards brake discs and calipers, radiators or specific underbody zones. When these parts are cracked, missing or poorly fitted, airflow can escape, cooling becomes less effective and surrounding components may run hotter than intended. Refreshing tired ducting helps your Porsche feel better looked after and supports consistent performance when driven enthusiastically.

  • Keep airflow directed to key areas such as brakes and radiators
  • Help manage heat during spirited road driving and track days
  • Reduce the impact of damaged, scraped or loose original ducting
  • Support long-term reliability of nearby components exposed to heat

Common options & kits

Individual replacement parts Specific ducts, scoops or spoilers that replace a single damaged or missing item without changing the rest of the system.

  • Ideal when only one side or section is cracked or lost
  • Lets you restore airflow to a specific brake, radiator or underbody area
  • Useful after minor impact or kerb damage

Matched sets or pairs Left and right ducts or front and rear components supplied together so both sides are renewed for consistent airflow.

  • Ensures balanced cooling from side to side
  • Reduces the chance of one old, brittle part failing later
  • A neat option when upgrading brake cooling as a package

Complete ducting kits Grouped components that provide an integrated cooling solution, often aimed at fast-road or track-focused Porsches.

  • All key pieces specified in one kit for a given bumper or undertray setup
  • Saves time cross-referencing individual part numbers
  • Ideal when optimising airflow as part of a wider performance build

Brands available in this category

For this category we stock a wide choice of trusted brands for Porsche models. You can also browse and filter by brand on this page to focus on your preferred manufacturers.

When should you review or replace your Porsche duct spoiler & air scoop?

Checking duct spoilers and air scoops periodically helps you spot impact damage or missing pieces before they compromise airflow to key components.

  • Visible cracks, broken mounting tabs or completely missing duct sections
  • Scraping damage from speed bumps or kerbs, especially on lowered Porsches
  • Loose or rattling panels that suggest failed clips or fixings
  • Evidence of overheated brakes or high coolant temperatures where cooling may be marginal

If any of these apply, it is a good time to review the duct spoilers and air scoops on your Porsche and replace anything damaged so cooling airflow is properly controlled again.

Explore Porsche duct spoilers & air scoops with Design911

Browse duct spoilers and air scoops for Porsche at Design911 — from simple replacement ducts to more focused cooling upgrades — and find options to suit everyday use, fast-road driving and track-focused projects.

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