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NGK IFR7X7G Laser Iridium Spark Plug (91039)
RRP. £23.32£15.07SAVE £8.25 (35%)
NGK IFR7X7G Iridium Spark Plug – Stock No. 91039
The NGK IFR7X7G is a high-quality iridium spark plug for reliable ignition under daily and spirited driving. It delivers a strong spark, stable idle, and clean combustion. It helps maintain performance on tuned and factory turbo petrol engines, especially under boost and higher cylinder pressures.
Iridium resists wear, so the gap stays stable for longer. That means consistent firing, smoother running, and fewer misfires over time. It can also aid cold starts and throttle response. Expect steady, durable performance rather than a dramatic power gain.
Use this plug only where specified. Always confirm fitment with the vehicle lookup or the Vehicle Fitment tab.
| Part Number | IFR7X7G |
|---|---|
| NGK Stock Number | 91039 |
| GTIN | 87295910399 |
| Category | 686 – Spark Plug |
| Type | Laser Iridium (iridium centre, platinum ground pad) |
| Heat Range | 7 (NGK scale) |
| Resistor | Yes |
| Thread Diameter | M14 x 1.25 |
| Reach (Thread Length) | 19 mm |
| Hex Size | 16 mm |
| Seat Type | Flat seat with gasket |
| Factory Gap | 0.8 mm (check and adjust only if specified by the manufacturer) |
| Centre Electrode | Fine-wire iridium |
| Ground Electrode | Nickel alloy with platinum pad |
| Recommended Torque | 25-30 Nm for M14 gasket seat in aluminium heads |
Why choose this plug
- Stable spark under boost for smoother power delivery.
- Long service life thanks to iridium centre and platinum pad.
- Helps reduce misfires and maintain fuel efficiency.
Important: Fit only to engines that specify IFR7X7G or an approved equivalent. Always tighten to the correct torque on a cool engine. Use our vehicle lookup to confirm compatibility, or check the Vehicle Fitment tab for full details.
The price displayed is for a single plug, please add the desired amount to your basket.
Additional Information
| Weight | 0.05 kg |
|---|---|
| Dimensions | 10 × 3 × 3 cm |
| Brand |
NGK-91039 Confirmed Fitment
Please note, this information is a combination of supplier provided compatibility data and our workshop expertise. While every effort has been made to ensure the accuracy of this information Progressive Parts Ltd are not liable for abnormalities or inaccurate data. Customers are wholly responsible for checking fitment for their vehicle. More information is available from our Terms & Conditions
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Stock at Progressive Parts
Delivery timescales are given as estimates in good faith, but cannot be taken as precise or exact information. We highly advise against booking installation/workshop time or engaging in preparatory work until you've received and inspected the goods.
What do our stock statuses mean?
1+ IN STOCK in green stock is readily available in one of our warehouses for express delivery (at the time of viewing).
LOW STOCK in green means we're running low! 1 or 2 left on the shelf so act fast. Over evenings, weekends and bank holidays this stock can move quickly so please bear this in mind.
0 IN STOCK in blue means our primary warehouse does not have unallocated stock, but our UK partners do. Often these can be shipped quickly and efficiently. You'll be notified via the Track My Order page if further delays are unavoidable.
MADE TO ORDER in blue means we've partnered with a supplier which primarily makes their products to order. It's not on our shelf, but your order goes into production immediately.
0 IN STOCK in orange means everybody we work with is unfortunately out of stock. Stock is not available in the UK. The best course of action is to place an order to create an allocation from the next batch arriving.
OUT OF STOCK in red. This product is unavailable to order, for whatever reason we're unable to obtain stock or there is an issue with supply/lead times.
We're tuners too!
Our staff are car enthusiasts, we understand the need for speed... This includes getting your orders out the door as quickly and securely as possible!
In some instances, extended lead times are unavoidable. This is as labour-intensive and frustrating for us as it is for you, please know we are doing our best to facilitate your modification goals. Abuse of our staff or systems will not be tolerated.
Thank you, Team PP
In the words of the Vehicle Standards Agency (VCA), type approval provides "confirmation that production and samples of a design will meet specified performance standards".
For emissions components this encompasses noise, emissions and balanced back pressure, which have a strong influence on maintaining engine performance (power), and fuel efficiency. Type approval ensures that an aftermarket component will reach, or exceed the performance standard of the corresponding OE part.
Type-approval then, is a certain guarantee that an end user will receive a product of OE equivalent performance attributes.
Products on the Progressive Parts website that meet this approval will be clearly marked or labelled EC or ECE approved.