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NGK Iridium Spark Plug Set One Step Colder 2006-2014 WRX / 2004-2021 STI / 2005-2009 LGT / 2004-2008 FXT

by NGK
SKU 2309
Save 40% Save 40%
Original price $73.23
Original price $73.23 - Original price $73.23
Original price $73.23
Current price $43.80
$43.80 - $43.80
Current price $43.80

NGK Iridium IX Spark Plugs are designed specifically for the performance enthusiast. Iridium IX offers extreme ignitability, improved throttle response and superior anti fouling.

The fine Iridium tip ensures high durability and a consistently stable spark. Iridium alloy has extremely high melting point, perfect for today's high-tech, high-performance engines. Trivalent Metal Plating - superior anti-corrosion and anti-seizing properties. Outstanding acceleration, high fuel efficiency and durability. Ultimate design, technology and performance.

These are one step colder plugs and are recommended for higher horsepower applications. A higher heat range number does not improve engine performance, it increases the plugs ability to dissipate heat.

Stock Number 2309
Heat Range: 7
Plug Gap: .032

Plugs are sold in sets of 4 only

Customer Reviews

Based on 3 reviews
Martin Aguilar
Must Have!!

They will not disappoint!! Man it lights a spark into my STI. Awesome quality and worth the upgrade


Thank you for sharing your 5 Star Review of the NGK Iridium Spark Plug Set! We are glad to hear that it has made a noticeable improvement in the performance of your STI. NGK is known for their high-quality spark plugs, and their iridium plugs are a popular choice for enthusiasts looking for better ignition performance. We hope you continue to enjoy your upgraded spark plugs!


Adam Ortiz

Fast shipping and my 14’ hatchback runs great with the one step colder plugs.


The NGK One Step Colder Iridium Spark Plug Set are a must have for your modded Subaru! The help reduce combustion chamber temps as well as engine knock! Thank you for your 5 Stars!


orville williams

you provided the wrong plug set for the 2007 subaru STI its a completely differemt size


Thank you for your review and I apologize for there being a mistake in your order please contact a Subimods Customer Support Rep. via email to or call us at 860-291-0015 so that we can rectify the issue.


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