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
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
Spark Plug WR8DC.
PACK OF 8
Fits:
Porsche 928 4.5L 1978-82
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99917017090
The product you are viewing cross references to these numbers
- Porsche 928 4.5L 1978-82
Special Offer Spark Plugs – Discounted Genuine and Performance Ignition Components
Special Offer Spark Plugs bring together discounted genuine, OEM-quality and performance ignition components designed to ensure efficient combustion, smooth engine operation and reliable starting performance. This category features limited-time promotions and clearance pricing on high-quality spark plugs from trusted automotive brands.
At Design911, our Special Offer Spark Plugs include genuine manufacturer-approved plugs and premium aftermarket options from leading brands such as Bosch, NGK and other performance ignition specialists — all selected for correct heat range, durability and precise engine compatibility.
What Do Spark Plugs Do?
Spark plugs are essential engine components responsible for igniting the air-fuel mixture inside the combustion chamber. Their key functions include:
• Creating the electrical spark required for combustion
• Supporting efficient fuel burn and engine performance
• Maintaining smooth idle and throttle response
• Improving fuel efficiency and reducing emissions
• Ensuring reliable cold starts and consistent power delivery
High-quality spark plugs help protect engine components while maintaining optimal performance across all driving conditions.
Why Choose Special Offer Spark Plugs?
Special Offer Spark Plugs are ideal for customers seeking reliable servicing parts at reduced pricing. Benefits include:
• Discounted genuine and OEM-quality spark plugs
• Access to premium ignition brands at promotional prices
• Cost-effective routine servicing and maintenance
• Limited-time savings on essential engine components
• Trusted compatibility with Porsche and performance vehicles
At Design911, all discounted spark plugs meet strict quality and specification standards to ensure correct fitment, heat range accuracy and long-term reliability.
When Should You Replace Spark Plugs?
Special Offer Spark Plugs are ideal when:
• Performing scheduled engine servicing
• Addressing misfires or rough idling
• Improving fuel efficiency and throttle response
• Restoring performance on high-mileage engines
• Taking advantage of limited-time promotional pricing
Replacing worn spark plugs at the recommended intervals helps maintain engine efficiency, reduce strain on ignition components and ensure consistent performance.
Monday-Friday: 8.30am - 5.30pm (GMT)
Saturday: Closed
Sunday: Closed