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Air Intake Boot
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
Rubber Sleeve
Sold each - 2 required per car
Fits
- Porsche Boxster 986 2.5L 1997–99
- Porsche Boxster 986 2.7L 1999–02
- Porsche Boxster S 986 3.2L 1999–02
- Porsche Boxster 986 2.7L 2003–04
- Porsche Boxster S 986 3.2L 2003–04
Diagram Ref No 28
What This Product Does
The sleeve creates a flexible junction in the intake distributor assembly. It allows limited movement between connected parts while supporting the sealed passage of intake air.
Functions
- Joins components within the intake distributor
- Maintains a sealed intake connection
- Allows for normal vibration and engine movement
- Helps prevent unwanted air from entering at the joint
Technical Details
- Part type: rubber sleeve
- Manufacturer: Porsche
- Part number: 99611068601
- Assembly location: intake distributor
- Diagram engine identifiers: M96.21/22 and M96.23/24
- Quantity indicated by the diagram: 2
Symptoms of Fault
- Cracks or splits that become visible when the sleeve is flexed
- Rubber that has hardened or become distorted with age
- A hissing sound around the intake system
- Unstable or rough engine idle
- Hesitation when accelerating
- Lean-mixture or airflow-related diagnostic faults
- Air leakage found during smoke testing
Why Replacement Matters
Repeated heat cycles, oil vapour and vibration can gradually deteriorate an intake sleeve. Replacing a leaking or damaged component helps re-establish the sealed connection needed by the intake distributor. The surrounding clamps, joints and adjacent rubber parts should also be examined while the assembly is accessible.
FAQs
- How can the sleeve be inspected?
Check its surface while gently flexing the rubber, as fine splits may only open under movement. A smoke test can be used to identify less obvious intake leaks. - Can a damaged sleeve cause poor running?
A leak at an intake joint may introduce unmetered air, which can contribute to an uneven idle, hesitation or mixture-related fault codes. - How many sleeves does the diagram specify?
The intake distributor diagram indicates a quantity of two for part 99611068601.
Check fitment for your specific vehicle (model, year, engine) before ordering.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99611068601
The product you are viewing cross references to these numbers
Air Intake Boots – Durable Airflow Connectors for Porsche Engines
Air intake boots are essential components of your Porsche’s intake system, connecting the air filter housing to the throttle body or intake manifold. These flexible connectors ensure that only clean, filtered air reaches the engine, maintaining efficient combustion and smooth performance. A high-quality air intake boot helps prevent unmetered air leaks that can lead to poor drivability, reduced performance, or increased emissions.
At Design911, we stock a comprehensive selection of genuine and high-quality air intake boots for numerous Porsche models like 911, Boxster, Cayman, Cayenne, Macan, and Panamera models. Each boot is built from durable, heat-resistant materials and designed for an exact fit to provide airtight sealing and long-lasting reliability.
What Do Air Intake Boots Do?
Air intake boots form a critical part of the engine’s air
management system. They:
- Deliver
clean, filtered air from the intake system to the engine.
- Maintain
airtight sealing for accurate air-fuel ratio control.
- Reduce
turbulence to improve engine efficiency and throttle response.
- Protect sensors like the MAF (Mass Air Flow) sensor from contaminants.
Properly functioning intake boots ensure stable idle, consistent power delivery, and efficient fuel combustion — key to maintaining Porsche’s renowned performance and responsiveness.
Why Do Air Intake Boots Fail?
Over time, air intake boots endure constant exposure to
heat, pressure, and engine vibration. Common causes of failure include:
- Cracking
or splitting from heat and age.
- Loose
clamps or fittings leading to air leaks.
- Oil
contamination softening or degrading the rubber.
- Vacuum
leaks causing unmetered air to enter the system.
- Improper installation or wear due to engine movement.
Symptoms of a failing air intake boot include rough idling, check engine light warnings, engine misfires, or loss of acceleration performance.
Why Replace a Damaged Air Intake Boot?
A cracked or leaking intake boot can allow unfiltered air into the engine, upsetting the air-fuel balance and potentially causing long-term engine damage. Replacing the boot restores correct airflow and maintains efficient engine operation.
Benefits of replacement include:
- Restored air-fuel ratio for improved performance.
- Reduced risk of engine misfires and stalling.
- Enhanced throttle response and smooth acceleration.
- Long-term reliability with manufacturer-quality construction.
All air intake boots available from Design911 are made from high-grade rubber or silicone compounds, ensuring superior resistance to heat, oil, and vibration for dependable performance in every driving condition.
