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Spark Plugs

Fits:
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
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99760210405
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
Replacing your ignition coils increases spark amperage by 100%, boosting spark energy for improved ignition and combustion. This is particularly beneficial for forced induction applications but also enhances the performance of naturally aspirated engines.
Designed to boost horsepower and torque throughout the RPM range while reducing fuel consumption. One Ignition coil required per cylinder, meaning six coils are needed for the engine

Fits:
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
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
SERVICEPACK996
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
OE Match iridium spark plug set (pack of 6) for Porsche Boxster 986 2.5L (1997–1999). Direct-fit replacement for part 99917020190, delivering reliable ignition performance and OE-equivalent combustion efficiency.
Sold individually, 6 required per engine
Fits:
Porsche Boxster 986 2.5L 1997 - 1999
This OE Match iridium spark plug set includes six identical spark plugs, each manufactured to OE-equivalent standards for thread dimensions, electrode geometry, and thermal characteristics. The iridium-tipped electrode provides a finer, more consistent spark than conventional spark plugs while offering improved resistance to wear and heat.
Porsche flat-six engines rely on precise ignition timing and stable combustion to deliver smooth performance and responsiveness. This OE Match set supports smooth idle, crisp throttle response, efficient fuel combustion, and consistent power delivery across the rev range. Replacing all spark plugs together ensures balanced ignition across cylinders and helps maintain correct engine operation.
Designed as direct replacements, these spark plugs install without modification and are ideal for routine servicing, tune-ups, or full ignition refresh work on early Boxster models.
Each spark plug generates a precisely timed electrical spark to ignite the air-fuel mixture in its cylinder. As a complete set, they ensure uniform combustion across all six cylinders, supporting smooth engine operation and reliable performance.
Function:
• Produces a reliable ignition spark for efficient combustion
• Iridium electrode improves spark stability and durability
• Supports smooth idle and responsive acceleration
• Helps maintain fuel efficiency and controlled emissions
Spark plugs wear over time due to heat, combustion pressure, and electrical load. Worn plugs can cause misfires, rough idle, reduced performance, and increased fuel consumption. Replacing all six plugs with an OE Match iridium set restores stable ignition, balanced combustion, and smooth engine performance while helping protect ignition coils and exhaust components.
When to replace:
• Engine misfires or uneven idle
• Hesitation or reduced throttle response
• Increased fuel consumption
• At manufacturer-recommended service intervals
• During routine ignition system servicing
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
Fits:
Porsche 911 (996)
Porsche 911 (997)
Porsche Boxster
Porsche Cayman
The Plasma Direct is an ignition coil with a built-in high-power amplifier. Plasma Direct Coils produce 4 times more spark energy than stock coils, and generate an ultra-fast multi-spark-discharge of 10 sparks up to highest RPM.
The spark amperage is increased by 100%, allowing the spark to reach many more molecules, which therefore accelerates the ignition and combustion processes. This is extremely important in forced induction applications, but also improves the performance of normally aspirated engines.
The Plasma Direct will increase horsepower and torque throughout the entire RPM range, as well as reducing fuel consumption. Even engines with legendary smoothness will be further refined with the Plasma Direct upgrade. Plasma Direct coils are OBD II compliant.
- 100% secondary current (Spark Amperage) increase.
- 4 times spark energy increase for the initial spark discharge.
- 8% Fuel Saving
- Easy installation.
- Compatible with all OEM components.
- Compatible with OBD-II (On-Board-Diagnostics).
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
4201Rx6
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 Boxster 987 2.7L 2005 -08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- 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 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- 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 Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
Fits:
Porsche 986 Boxster / Boxster S 1997-02
Porsche 996 C2 / C4 3.4L 1998-01
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
The BERU spark plug set (pack of 6) is a complete ignition service solution engineered for the Porsche Boxster 986 2.5-litre flat-six engine. This set includes all six spark plugs required for a full engine service, ensuring balanced combustion and reliable performance across every cylinder.
PACK OF 6
Fits:
Porsche Boxster 986 2.5L 1997 - 1999
Spark plugs are essential components of the ignition system, producing the electrical spark that ignites the air–fuel mixture inside each combustion chamber. Using correctly specified spark plugs helps maintain efficient combustion, smooth idle, crisp throttle response, reliable cold starting, and optimal fuel efficiency. Over time, spark plugs wear or become fouled, which can cause misfires, rough running, reduced power, and higher fuel consumption if not replaced at the proper interval.
Manufactured by BERU, a trusted supplier of ignition technology, these spark plugs are built with precise heat range and electrode design matched to the Porsche Boxster 986 2.5L. The durable construction resists fouling and wear, delivering consistent ignition performance and long service life under both everyday driving and spirited use.
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 BOSCH spark plug set (pack of 6) is a complete ignition service solution designed specifically for the Porsche 986 Boxster 2.5-litre flat-six engine. This set includes all six spark plugs required for a full engine replacement, ensuring balanced combustion and consistent ignition performance across all cylinders.
PACK OF 6
Fits:
Porsche Boxster 986 2.5L 1997 - 1999
Spark plugs are a critical component of the ignition system, responsible for igniting the air-fuel mixture within the combustion chamber. Correct specification spark plugs help maintain smooth engine operation, reliable cold starting, responsive throttle performance, and efficient fuel combustion. Worn or incorrect spark plugs can lead to misfires, rough idle, reduced power, and increased fuel consumption.
Manufactured by Bosch, an original equipment supplier to Porsche, these spark plugs are engineered to meet OEM specifications for the 986 Boxster 2.5L. Precision heat range and electrode design ensure dependable ignition performance, reduced fouling, and long service life, making this set ideal for routine servicing, preventative maintenance, or maintaining factory-correct performance.
• Creates a precise spark to ignite the air-fuel mixture
• Supports efficient combustion and smooth engine operation
• Helps maintain performance, fuel efficiency, and drivability
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

Ignition Coil Pack Screw. M6 X 25
Note: These are for use with the original smaller bodied Porsche ignition coils. If in doubt please seek clarification before purchase/installation.
12pcs Required per car
Fits:
Porsche 996
Porsche 986 Boxster
Porsche 996 GT3 MKI
Porsche 996 GT3 MKII
Porsche 996 Turbo
Porsche 987
Porsche 987C Cayman
Porsche 997 3.6L, 3.8L / 997 GT3
Click 'Zoom in' for large parts diagram.
Diagram ref no 3
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90006708901
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 Boxster 987 2.7L 2005 -08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- 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 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- 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 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
6 Required per engine. Price is for each. (if you require screws order code 90006708901)
Replacing your ignition coils increases spark amperage by 100%, boosting spark energy for improved ignition and combustion. This is particularly beneficial for forced induction applications but also enhances the performance of naturally aspirated engines.
Designed to boost horsepower and torque throughout the RPM range while reducing fuel consumption. One Ignition coil required per cylinder, meaning six coils are needed for the engine

Fits:
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
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99760210703
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
6 Required per engine. Price is for each.
Fits:
Porsche Boxster 986 2.5L 1997 - 1999
Porsche Boxster 986 2.7L 1999 - 2002
Porsche Boxster S 986 3.2L 1999 - 2002
Porsche 996 C2 3.4L 1997 - 08/2001
Porsche 996 C4 3.4L 1997 - 08/2001
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99760210704
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
6 Required per engine. Price is for each.

Fits:
Porsche Boxster 986 2.5L 1997-99
Porsche Boxster 986 2.7L 2003-2004
Porsche Boxster S 986 3.2L 2003-2004
Porsche 996 C2 3.4L 1997-08/01
Porsche 996 C4 3.4L 1997-08/01
Porsche 996 3.6L Inc. C2 / C4 / C4S
Porsche 996 GT3 MKI
Porsche 996 GT3 MKII
Porsche 996 Turbo
Porsche 987 Boxster 2.7L / 3.2L
Porsche 987C Cayman 2.7L / 3.4L
Porsche 997 3.6L, 3.8L / 997 GT3
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99760210405
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 Boxster 987 2.7L 2005 -08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- 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 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- 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 Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
This OE Match iridium spark plug features an iridium-tipped electrode, offering a finer and more consistent spark compared to standard spark plugs. The iridium construction improves ignition efficiency and provides increased resistance to wear, making it well suited to the operating demands of Porsche flat-six engines.
Sold individually, 6 required per engine
Fits:
Porsche Boxster 986 2.5L 1997 - 1999
Manufactured to OE-equivalent standards, this spark plug delivers correct thread dimensions, electrode geometry, and thermal characteristics required for stable combustion. It supports smooth idle, crisp throttle response, efficient fuel burn, and consistent power delivery throughout the rev range.
Designed as a direct replacement, this spark plug installs without modification and is ideal for routine servicing, tune-ups, or replacement of individual worn plugs while maintaining OE-equivalent ignition performance.
The spark plug generates a precisely timed electrical spark inside the combustion chamber to ignite the air-fuel mixture. This ignition process enables efficient combustion, smooth engine operation, and reliable power output.
Function:
• Produces a reliable ignition spark for efficient combustion
• Iridium electrode improves spark stability and durability
• Supports smooth idle and responsive acceleration
• Helps maintain fuel efficiency and controlled emissions
Spark plugs wear due to heat, combustion pressure, and electrical load. Worn plugs can cause misfires, rough idle, reduced performance, and increased fuel consumption. Replacing worn plugs with an OE Match iridium spark plug restores reliable ignition, balanced combustion, and smooth engine performance.
When to replace:
• Engine misfires or uneven idle
• Hesitation or reduced throttle response
• Increased fuel consumption
• At manufacturer-recommended service intervals
• During routine ignition system servicing
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
6 Required per engine. Price is for each.

Fits:
Porsche 986 Boxster 2.5L 1997-99
Porsche 986 Boxster 2.7L 2000-02
Porsche 986 Boxster S 3.2L 2000-02
Porsche 996 Carrera 3.4L 1998-99
Click 'Zoom in' for large parts diagram.
Diagram ref no 2
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99660210301
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
6 Required per engine; sold individually.
Fits:
Porsche 986 Boxster / Boxster S 1997-02
Porsche 996 C2 / C4 1998-01
Click 'Zoom in' for large parts diagram.
Diagram ref no 29
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99970721540
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
x6 required per engine; sold individually.
Fits:
Porsche 986 Boxster / Boxster S 1997-02
Porsche 996 C2 / C4 1998-01
Click 'Zoom in' for large parts diagram.
Diagram ref no 29
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99970721540
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
6 Required per engine; sold individually.
Fits:
Porsche 986 Boxster / Boxster S 1997-02
Porsche 996 C2 / C4 1998-01
Click 'Zoom in' for large parts diagram.
Diagram ref no 28
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99970734341
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
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.