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NGK Iridium Spark Plug One Step Colder 2309 - Subaru EJ25 Turbo Models (inc. 2004+ STI / 2006-2014 WRX)
NGK Iridium Spark Plug One Step Colder 2309 - Subaru EJ25 Turbo Models (inc. 2004+ STI / 2006-2014 WRX)
NGK Iridium Spark Plug One Step Colder 2309 - Subaru EJ25 Turbo Models (inc. 2004+ STI / 2006-2014 WRX)
NGK Iridium Spark Plug One Step Colder 2309 - Subaru EJ25 Turbo Models (inc. 2004+ STI / 2006-2014 WRX)
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User Media for: NGK Iridium Spark Plug One Step Colder 2309 - Subaru EJ25 Turbo Models (inc. 2004+ STI / 2006-2014 WRX)

NGK Iridium Spark Plug One Step Colder 2309

Subaru EJ25 Turbo Models (inc. 2004+ STI / 2006-2014 WRX)

Read 19 Reviews | 15 Q&As
Part # LFR7AIX
$6.36
msrp: $18.31

In stock!
ANY QUESTIONS?

Features & Product Details

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: .031

Please Note: This is a single plug. For a set of 4, use NGK LFR7AIX-GRP.

Specifications

Brand: NGK
Heat Range: 7
Plug Gap: .031
Stock Number: 2309
Mfgr. Warranty: 60 Days
Condition: New Product
Return Policy:
Standard

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REVIEWS & CUSTOMER MEDIA

19 Reviews
4.9 out of 5 Stars
5 Stars
(18)
4 Stars
(1)
3 Stars
(0)
2 Stars
(0)
1 Stars
(0)
Customer Photos and Videos
NGK Iridium Spark Plug One Step Colder 2309 ( Part Number: LFR7AIX)
Works as expected 7 years ago
5out of 5stars
larrysturgill8299286
Great product and as always RSD service.
  
Was this review helpful?
 7 years ago
5out of 5stars
pwatson13029
Car idles great and is smooth throughout the RPM range. The only downside was the install, but that is Subaru packaging for you.
  
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One of those must do mods for stage 2+ 8 years ago
5out of 5stars
LOLFUNCTION
I did so many other mods at once I can't say I noticed a difference. The rumors are true, the install sucks but it's definitely doable. Just takes patience, and a second set of hands definitely.
  
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Great spark plug! 8 years ago
5out of 5stars
grobelny.ece50834
These plugs are the best. I love that they come pre-gapped. They helped to fix a rough idle/misfire issue on my '11 wrx.
  
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Smoooooth 8 years ago
5out of 5stars
Rashad
Installed these as soon as they came in the mail. I previously had Denso's installed and so far the NGK's seem to idle smoother. As always, fast shipping and great service from RSD. Thanks again guys.
  
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QUESTIONS & ANSWERS

  • Q: Stock 2006 STI  TGSK2 years ago

    Will these work for a stock 2006 STI?
    • 0 of 0 people found the following answer helpful

      A:  You will want stock heat range plugs for your STI. One step colder plugs are only necessary once you're roughly 100 whp over stock.

      Marcus E. @ RallySport Direct 2 years ago  
        
      Was this answer helpful?
  • Q: 2017 Sti  Eulises2 years ago

    Currently installing these, 2 went in fine however 2 don't go in all the way. When installing I turn it like 5 times then plug becomes super tight so I stop. Putting the coil on I find out coil doesn't seal onto block because plug needs to be fastened more into the block I guess. Would anti seize help maybe? (Alrdy did die eletric grease on coil boot)
    • 0 of 0 people found the following answer helpful

      A:  Anti-seize may help. If possible to clean the threads without getting debris into the engine may help as well.

      Michael N.
        
      Was this answer helpful?
  • Q: DOES IT WORK FINE WITH E85?  FABIO TATEMOTO4 years ago

    I am wondering work with E85 full. Is there any problem or this spark works perfect with it?
  • Q: plugs   chrismoore66 years ago

    I have been looking to go to these but the upgrades I have are a full turbo back exhaust, new intake, new bov, and pro tuned. Would this be a good upgrade.
    • 0 of 0 people found the following answer helpful

      A:  This is likely not a good option for your setup, sticking with the stock heat range plugs would be best.

      ryanw20299728
        
      Was this answer helpful?
  • Q: 2008 WRX w/ VF52 swap  rstevensunleeshd257487 years ago

    I'm running a catless TBE, AEM CAI, Grimmspeed EBCS and VF52 turbo on a bit of an aggressive tune. I know I'm beyond 100hp over the stock 2008 WRX power levels and I've been having some issues with feedback knock, should I install these one step colder plugs?
    • 0 of 0 people found the following answer helpful

      A:  Unfortunately we do not have a way to verify whether it would be best to run a step colder. I recommend speaking with your tuner and seeing what they recommend for your setup.

      Nick S. @ RallySport Direct 7 years ago  
        
      Was this answer helpful?

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