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Spark Plugs
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
Sold individually; x6 required per engine.
Fits:
Porsche 986 Boxster / Boxster S 1997-02
Porsche 996 C2 / C4 3.4L 1998-01
Click 'Zoom in' for large parts diagram.
Diagram ref no 27
*Please note that Genuine Porsche spark plug tubes do not come with replacement o-rings. We recommend replacing the o-rings at the same time. They are available for purchase separately, and you will be prompted to add them to your basket during checkout.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610532552
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
This spark plug tube is engineered as a direct replacement for the original Porsche spark plug tube. It provides a sealed, precision-fit channel through the cylinder head for the spark plug, preventing coolant ingress while supporting proper plug alignment and ignition performance.
Sold individually, 6 required per engine.
Fits:
Porsche 986 Boxster / Boxster S 1997 - 2002
Porsche 996 C2 / C4 3.4L 1998 - 2001
Diagram ref no 27, 28 and 29.
The spark plug tube provides a protective and sealed passage for the spark plug through the cylinder head. It:
• Supports and protects the spark plug from contamination by engine coolant
• Prevents coolant intrusion into the spark plug well
• Maintains electrical insulation and correct plug orientation
• Helps preserve consistent ignition performance and combustion integrity
Spark plug tubes are subjected to age, heat, coolant chemicals, and vibration. Over time the tube can stiffen, crack, or lose sealing effectiveness, allowing coolant to seep into the plug well. This often leads to misfires, poor starting, coil damage, or electrical shorts, and is a common service item on aging Porsche M96 engines. Replacing compromised tubes with a high-quality OE Match spark plug tube restores the correct seal and prevents expensive ignition coil or wiring damage, especially during engine rebuilds, head gasket services, or preventative maintenance.
When to replace:
• During cylinder head removal or service
• Evidence of coolant in spark plug wells
• Misfires or ignition issues traced to moisture/coolant
• Cracked, brittle, or deteriorated tube material
• Preventive refresh on high-mile engines
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610532552
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
The Bosch FR7LDC multi-ground spark plug is an OEM-quality ignition component designed for the Porsche Boxster 986 2.5-litre flat-six engine. Featuring Bosch’s multi-ground electrode design, this spark plug delivers stable ignition performance, improved resistance to electrode wear, and consistent combustion across a wide range of driving conditions.
Sold individually, 6 spark plugs required per engine.
Fits:
Porsche Boxster 986 2.5L 1997 - 1999
Spark plugs are responsible for igniting the air-fuel mixture within the combustion chamber. The multi-ground electrode configuration of the FR7LDC helps distribute spark energy more evenly, reducing electrode erosion and maintaining reliable ignition over an extended service life. This results in smooth engine operation, dependable cold starting, and consistent throttle response.
Key Functions & Benefits:
• 50 percent longer life than traditional copper core spark plugs
• Exclusive Yttrium extruded copper core center electrode increases resistance to spark erosion
• Tapered, v-profile nickel chromium ground electrode for consistent performance and prolonged service life
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99917020190
The product you are viewing cross references to these numbers
- 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
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 955 Cayenne S 4.5L V8 2003-06
Price is for each.
Fits:
Porsche Boxster 986 2.7L 1999-02
(6 Required per engine.)
Porsche Boxster S 986 3.2L 1999-02
(6 Required per engine.)
Porsche Boxster 986 2.7L 2003-04
(6 Required per engine.)
Porsche Boxster S 986 3.2L 2003-04
(6 Required per engine.)
Porsche 996 C2 3.4L 1997-08/01
(6 Required per engine.)
Porsche 996 C4 3.4L 1997-08/01 (6 Required per engine.)
Porsche 955 Cayenne V8 S M48.00 2003-06 (8 Required per engine.)
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99917020791
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
The Porsche Genuine OE Spark Plug is a factory-specified ignition component built to Porsche’s exact original equipment standards. This OE spark plug (often designated as 14FR7LDU / FR7LDC+) is designed to deliver the precise spark characteristics required by the 2.5-litre flat-six M96.20 engine in early Boxster 986 models.
Sold individually, 6 spark plugs required per engine.
Fits:
Porsche Boxster 986 2.5L 1997 - 1999
Spark plugs are a vital part of the ignition system - they produce the high-voltage electrical spark that ignites the air-fuel mixture inside the engine’s combustion chamber. A properly specified and fitted spark plug ensures efficient combustion, smooth engine running, and reliable start-up.
Functions & Technical Role
• Ignition source: Generates the spark needed for each cylinder to fire properly.
• Efficient combustion: Promotes complete fuel burn for better power delivery and economy.
• Idle stability: Helps reduce misfire, rough idle, and hesitation.
• Correct OE heat range & gap: Engineered to Porsche’s original specification for the Boxster 986 2.5L engine.
• Durable construction: Long-lasting performance suited to normal service intervals.
Spark plugs naturally wear down due to heat cycling, electrode erosion, and combustion deposits, which can lead to misfires, rough idle, reduced power, and poorer fuel economy. Replacing them with Genuine Porsche OE spark plugs restores correct gap, heat range, and spark characteristics - helping preserve performance, efficiency, and engine responsiveness.
When to replace spark plugs:
• At manufacturer-recommended service intervals (typically at major services)
• During routine engine tune-ups
• If experiencing misfires, rough idle, or loss of power
• When starting becomes inconsistent
• If fuel economy decreases significantly
• During engine diagnostics or rebuild work
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99917020190
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
The BERU spark plug is a high-quality ignition component engineered to meet or exceed OEM performance requirements on the Porsche Boxster 986 2.5-litre flat-six engine. Designed for reliable ignition and long service life, this spark plug ensures your Boxster delivers smooth combustion, crisp throttle response, and dependable starting.
Sold individually, 6 spark plugs required per engine.
Fits:
Porsche Boxster 986 2.5L 1997 - 1999
Spark plugs are essential to engine performance - they produce the electrical spark that ignites the air-fuel mixture in the combustion chamber. A properly specified and well-maintained spark plug helps sustain efficient combustion, optimize fuel economy, and prevent rough idling or misfires. Worn or incorrect plugs can lead to power loss, higher emissions, and reduced drivability.
Manufactured by BERU, a trusted supplier of ignition technology, this spark plug is built with precise heat range and electrode design suited to the Boxster’s engine requirements. Its durable construction resists fouling and wear, delivering consistent spark performance under daily driving and spirited conditions alike. Supplied as an individual unit, you can order the exact quantity needed for maintenance or service.
• Generates a controlled spark to ignite the air-fuel mixture
• Supports smooth combustion, steady idle, and responsive performance
• Helps maintain fuel efficiency and reliable starting
Spark plugs are vital to reliable ignition and efficient combustion. As they wear, spark quality deteriorates, which can lead to misfires, rough running, reduced performance, and increased fuel consumption. Replacing spark plugs at the correct interval helps maintain smooth engine operation, protects the ignition system, and ensures consistent drivability.
When spark plugs should be replaced:
• At the manufacturer’s recommended service interval
• If the engine misfires or runs unevenly
• When cold starting becomes difficult
• If fuel economy or throttle response declines
• When plugs show signs of wear, fouling, or corrosion
• During major servicing or preventative maintenance
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99917020190
The product you are viewing cross references to these numbers
Porsche Spark Plugs | Design911 High-Performance Ignition Components for Power & Efficiency
Spark plugs play a vital role in the performance, efficiency, and reliability of your Porsche’s engine. They ignite the air-fuel mixture inside the combustion chamber, creating the precise explosion needed to generate power. High-quality spark plugs ensure clean ignition, smooth acceleration, and reduced emissions — helping your Porsche perform exactly as intended on every drive.
At Design911, we stock a full range of spark plugs from leading manufacturers, engineered for superior conductivity, heat resistance, and long service life. Available in iridium, platinum, and copper-core designs, each spark plug is precision-crafted to match your Porsche’s specific ignition requirements. Ideal for routine maintenance, tuning, or complete engine rebuilds, our spark plugs ensure reliable performance from idle to redline.
What Do Spark Plugs Do?
Spark plugs are critical ignition components that deliver the electric spark required to ignite the air-fuel mixture in the combustion chamber.
Core Functions:
• Create a high-voltage spark to initiate combustion.
• Ensure smooth, efficient engine operation.
• Support optimal fuel economy and throttle response.
• Reduce emissions through clean, consistent ignition.
• Maintain balanced power delivery and idle stability.
When properly maintained, spark plugs enhance both performance and fuel efficiency, ensuring your Porsche runs with precision and reliability.
Why Do Spark Plugs Fail or Degrade?
Spark plugs operate under intense pressure, heat, and chemical exposure — gradually wearing down over time and mileage.
Common Causes of Failure Include:
• Electrode wear from prolonged high-temperature operation.
• Carbon or oil fouling from incomplete combustion.
• Cracked or degraded insulators due to thermal stress.
• Incorrect heat range or plug gap settings.
• Age-related corrosion or weakened spark performance.
Failing spark plugs can cause rough idling, misfires, reduced fuel economy, and loss of power — making regular replacement essential to maintain your Porsche’s performance.
Why Replace or Upgrade Your Porsche Spark Plugs?
Replacing worn spark plugs restores full ignition efficiency, fuel economy, and responsiveness. Upgrading to performance-grade materials can also improve durability and spark precision for motorsport or tuned applications.
Key Benefits:
• Restores smooth acceleration and idle stability.
• Improves fuel efficiency and throttle response.
• Reduces misfires, vibration, and engine hesitation.
• Available in platinum, iridium, and copper-core configurations.
• Compatible with Porsche 911, 944, 968, Boxster, Cayman, Panamera, and Macan
models.
• Ideal for servicing, tuning, or complete engine rebuilds.
Design911’s Porsche spark plugs deliver performance, precision, and protection — ensuring consistent ignition and long-lasting reliability for your Porsche engine.
Highlights
• Premium Porsche spark plugs for all engine
types.
• Precision-engineered for reliable combustion and performance.
• Available in standard and high-performance variants.
• Improves efficiency, throttle response, and emissions.
• Fits both classic and modern Porsche models.
• Perfect for servicing, performance tuning, or restoration.
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