do not press the back button…
Enter your VAT number here and click Verify:
Your details have been verified. VAT number registered to:
,
.
Your order will now be zero rated for VAT purposes. We reserve the right to verify these details after your order request has been made and reinstate VAT if required.
Your VAT details were not recognised or were invalid. Your VAT number must be matched to your Billing Country as specified above. This is currently specified as . You do not need to enter the country code part of your VAT number as this has already been selected in your billing address details above.
The VAT number checking service is currently offline. Please supply your VAT details within the comments or special instructions field below and we will apply a VAT discount after placing your order request.
Spark Plugs
OE Match spark plug set (pack of 8) designed as a direct replacement for Porsche factory spark plugs in fit, heat range, and ignition performance. Supplied as a complete set of eight, it is intended for Porsche engines requiring this spark plug specification where a full eight-plug replacement is needed.
PACK OF 8
Fits:
Porsche 928S / 928S2 / 928S4 / 928GT 1983 - 1991
Porsche 928 GTS 1992 - 1995 (M28.49/50)
This OE Match spark plug set contains eight identical spark plugs, each manufactured to OE-equivalent standards for materials, electrode design, and thermal performance. Engineered to withstand high combustion temperatures and sustained electrical load, these plugs deliver consistent ignition and balanced combustion across all cylinders.
Replacing spark plugs as a complete set ensures even ignition timing and smooth engine operation. Over time, worn or mismatched plugs can lead to misfires, hesitation, reduced throttle response, and increased fuel consumption. This OE Match pack of eight offers a cost-effective alternative to genuine OE parts while preserving correct performance, reliability, and direct-fit compatibility.
All spark plugs install without modification, making this set ideal for scheduled servicing, tune-ups, or ignition system maintenance.
The spark plugs generate precisely timed electrical sparks to ignite the air-fuel mixture in each combustion chamber. As a full set, they ensure uniform combustion, supporting smooth engine operation, efficient fuel burn, and consistent power delivery.
Function:
• Generates a consistent ignition spark for combustion
• Supports smooth idle and responsive acceleration
• Helps maintain proper fuel efficiency and emissions control
• Direct-fit replacement for easy installation
A worn or incorrect spark plug can cause rough running, misfires, loss of power, and reduced fuel economy. Using a correct OE Match spark plug ensures ignition performance remains consistent with factory expectations, helping preserve engine reliability and long-term efficiency.
When to replace:
• Engine misfires or uneven idle
• Hesitation or reduced throttle response
• Increased fuel consumption
• At manufacturer-recommended service intervals
• During tune-ups or ignition system maintenance
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99917015690
The product you are viewing cross references to these numbers
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
This BOSCH spark plug set (pack of 8) is a complete ignition service solution specifically designed for the Porsche 928 V8 engine. This set contains all eight spark plugs required for a full engine replacement, ensuring balanced combustion and consistent performance across all cylinders.
PACK OF 8
Fits:
Porsche 928S / 928S2 / 928S4 / 928GT 1983 - 1991
Porsche 928 GTS 1992 - 1995 (M28.49/50)
Spark plugs play a critical role in engine operation by igniting the air-fuel mixture within the combustion chamber. Worn or incorrect plugs can lead to misfires, poor throttle response, increased fuel consumption, and hard starting. These Bosch spark plugs are engineered to deliver a strong, stable spark, promoting efficient combustion, smooth engine running, and reliable cold starts.
Manufactured to OEM specifications, Bosch spark plugs are precision-matched to the correct heat range and electrode design required by the Porsche 928. This ensures long service life, reduced fouling, and dependable performance under both normal driving and high-load conditions. Ideal for routine servicing, preventative maintenance, or full ignition system refresh on classic Porsche 928 models.
Key Functions:
• Ignites the air-fuel mixture for efficient combustion
• Supports smooth idle and stable engine performance
• Improves throttle response and fuel efficiency
• Helps prevent misfires and uneven cylinder operation
Features & Benefits
• Genuine Bosch manufacture
• Complete set of 8 spark plugs for V8 engines
• OEM-quality materials and construction
• Correct heat range for Porsche 928 applications
• Designed for durability and consistent ignition performance
• Suitable for routine servicing and engine maintenance
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99917015690
The product you are viewing cross references to these numbers
- Porsche 928GTS 5.4L 1992-95
Fits:
Porsche 928 S4 / GT / GTS 1987-96
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92860231100
The product you are viewing cross references to these numbers
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Shop Securely
12 Month Warranty
Worldwide Delivery
Express Delivery
Price is for each.
Fits:
Porsche 911 3.2L WITH CATALYST 1984-89
Porsche 924S 2.5L 1986-88
Porsche 928S / 928S2 / 928S4 / 928GT 1983-1991
Porsche 928 GTS 1992-95 (M28.49/50)
Porsche 944 / 944S / 944S2 / 944T 1985-91
Porsche 968 1992-95 (M44.43/44)
Porsche 912E
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99917015690
The product you are viewing cross references to these numbers
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
- Porsche 944 Turbo 2.5L 8V 1985-88
- Porsche 944 Turbo 2.5L 8V 1989-91
- Porsche 944 Turbo S 2.5L 8V 1988
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
- Porsche 912E 4CYL 1976
Shop Securely
12 Month Warranty
Worldwide Delivery
Express Delivery
The spark plug produces a precisely timed electrical spark to ignite the air-fuel mixture within the combustion chamber. This ignition process enables smooth engine operation, efficient fuel burn, and reliable power output.
Sold individually, 4, 6 or 8 required depending on engine type
Fits:
Porsche 911 3.2L 1984 - 89 *with catalyst
Porsche 924S 2.5L 1986 - 1988
Porsche 928S / 928S2 / 928S4 / 928GT 1983 - 1991
Porsche 944 / 944S / 944S2 / 944T 1985 - 1991
Porsche 912E
Porsche 968 1992 - 1995 Coupe
Spark plugs play a critical role in engine efficiency, smoothness, and power delivery. Over time, wear from heat and combustion stress can reduce spark quality, leading to misfires, hesitation, and increased fuel consumption. Replacing worn plugs with an OE Match unit restores proper ignition timing and helps maintain optimal engine performance.
Designed for direct installation with no modification required, this spark plug is suitable for routine servicing, diagnostics, or replacement of individual worn plugs.
Function:
• Generates a consistent ignition spark for combustion
• Supports smooth idle and responsive acceleration
• Helps maintain proper fuel efficiency and emissions control
• Direct-fit replacement for easy installation
A worn or incorrect spark plug can cause rough running, misfires, loss of power, and reduced fuel economy. Using a correct OE Match spark plug ensures ignition performance remains consistent with factory expectations, helping preserve engine reliability and long-term efficiency.
When to replace:
• Engine misfires or uneven idle
• Hesitation or reduced throttle response
• Increased fuel consumption
• At manufacturer-recommended service intervals
• During tune-ups or ignition system maintenance
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99917015690
The product you are viewing cross references to these numbers
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
- Porsche 944 Turbo 2.5L 8V 1985-88
- Porsche 944 Turbo 2.5L 8V 1989-91
- Porsche 944 Turbo S 2.5L 8V 1988
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
- Porsche 912E 4CYL 1976
Shop Securely
12 Month Warranty
Worldwide Delivery
Express Delivery
8 Required per engine. Price is for each.
Fits:
Porsche 928 GTS 1992-95 (M28.49/50)
Porsche 968 1992-95 (M44.43/44)
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9991701899A
The product you are viewing cross references to these numbers
- Porsche 968 3.0L 1992-94
- Porsche 928GTS 5.4L 1992-95
Shop Securely
12 Month Warranty
Worldwide Delivery
Express Delivery
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.
-
Service Kits OE Parts
-
Oil Filters
-
Air Filters
-
Pollen/Particle Filters
-
Fuel Filters
-
Belts All Types
-
IRIDIUM POWER Spark Plugs
-
IRIDIUM RACING Spark Plugs
-
Front Wiper Arms & Blades
-
Rear Wiper Arms & Blades
-
Gearbox Service Parts
-
Porsche Classic Motor oil
-
Engine Oil & Lubricants - Mobil
-
Engine Oil & Lubricants - Total
-
Engine Oil & Lubricants - Castrol
-
Engine Oil & Lubricants - Motul
-
Engine Oil & Lubricants - Millers Oils NanoDrive
-
Engine Oil & Lubricants - Millers Oils
-
Fuel Additives
-
Garage PPE
Monday-Friday: 8.30am - 5.30pm (GMT)
Saturday: Closed
Sunday: Closed