NGK R2349-9 Racing Spark Plug (4418)
Original price was: £107.05.£60.73Current price is: £60.73.
NGK R2349-9 Racing Spark Plug (Stock No. 4418)
The NGK R2349-9 is a motorsport-grade spark plug designed for hard use under high load and high rpm. It delivers a strong, stable spark to help prevent misfires when cylinder pressures rise, such as on turbo or high-compression engines. Its cold heat range (9) helps control combustion temperatures and reduces the risk of detonation during sustained performance driving.
Use this plug when tuning pushes ignition demands beyond what standard road plugs can reliably handle. Expect cleaner combustion at the limit, consistent firing, and better resistance to knock under boost. It will not add power on its own, but it can support reliable power when the engine is mapped correctly.
Always confirm fitment and required gap for your specific engine. Do not assume preset gap is correct.
| Part Number | R2349-9 |
| NGK Stock Number | 4418 |
| Category | 686 – Spark Plug |
| GTIN | 087295144183 |
| Type | Racing spark plug |
| Heat Range (NGK) | 9 (cold – suited to high load/high temperature use) |
| Intended Use | Track, competition, and high-performance tuned engines |
| Gap | Set to engine builder/tuner specification |
| Compatibility | Used in select motorsport and high-performance applications. Use the vehicle lookup to confirm fitment. |
When to choose a heat range 9 plug
– If you run higher boost, advanced timing, or sustained track sessions.
– If you see signs of heat stress on standard plugs (glazing, pre-ignition, or knock).
Installation tips
– Check thread cleanliness and seat type on your cylinder head before fitting.
– Torque to the engine manufacturer’s spec.
– Set and verify the gap after any indexing washers or changes to coil setup.
The price displayed is for a single plug, please add the desired amount to your basket.
| Weight | 0.05 kg |
|---|---|
| Dimensions | 10 × 3 × 3 cm |
| Brand |
NGK-4418 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
UK Shipping
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DELIVERY INFORMATION
International Shipping
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DELIVERY INFORMATION
Returns
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Stock at Progressive Parts
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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).
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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.
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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
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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.