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NGK Iridium Spark Plugs One Step Colder 2309 (Part Number: )
NGK Iridium Spark Plugs One Step Colder 2309 (Part Number: )
NGK Iridium Spark Plugs One Step Colder 2309 (Part Number: )
NGK Iridium Spark Plugs One Step Colder 2309 (Part Number: )
NGK Iridium Spark Plugs One Step Colder 2309 (Part Number: )
NGK Iridium Spark Plugs One Step Colder 2309 (Part Number: )
NGK Iridium Spark Plugs One Step Colder 2309 (Part Number: )
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NGK Iridium Spark Plugs One Step Colder 2309 (Part Number: )
NGK Iridium Spark Plugs One Step Colder 2309
Subaru EJ25 Turbo Models (inc. 2004+ STI / 2006-2014 WRX)
Read 19 Reviews | 64 Q&As
Part # LFR7AIX-GRP
$44.80
msrp: $73.24

In stock! Ships same day

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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

Specifications

Brand: NGK
Heat Range: 7
Plug Gap: .031
QTY: 4
Stock Number: 2309
Mfgr. Warranty: 60 Days
Condition: New Product
Return Policy:

RallySport Guarantee - 30 Days


Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.
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REVIEWS & CUSTOMER MEDIA

19 Reviews
4.7 out of 5 Stars
5 Stars
(15)
4 Stars
(3)
3 Stars
(1)
2 Stars
(0)
1 Stars
(0)
Customer Photos and Videos
NGK Iridium Spark Plugs One Step Colder 2309 ( Part Number: LFR7AIX-GRP)
Surprised at the different. Stage 2+ 13' WRX 4 months ago
JTO
I'm running an e-tune from torqued performance for stage 2 and I was regularly getting feedback knock (accessport), small numbers that tuner said weren't dangerous but it still bothered me. Tuner recommended the added protection of these and after install I'm getting zero feedback knock. Weird note: My exhaust note changed slightly with these.
  
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Worked as intended  4 months ago
Jordan Daniels
Pre gapped plugs. Worked as advertised.
  
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Good plugs 7 months ago
jghost
Used on a protuned 06 legacy gt. Helped keep egt in check and fit perfect!
  
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Fast shipping  7 months ago
Motrudboy
Ngk plugs are top of the line, one step colder works great with 400whp on my Sti.
  
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 8 months ago

  
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QUESTIONS & ANSWERS

  • Q: Do I need a new tune?  Omar3 days ago

    Do I need a new tune once I install these spark plugs? I am planning on tuning it again for stage 3 but I am not ready just yet. 2010 STI
    • 0 of 0 people found the following answer helpful

      A:  There should be no need for these plugs at your power level, however, a tune would not be required.

      Devan M. @ RallySport Direct 3 days ago  
        
      Was this answer helpful?
  • Q: Other than stock   subie doo13 days ago

    So the guy with the 2007 Sti asked if hes pushing 315 with 350 Torque the plugs aren't recommended. My STI pro tuned with E85 on a mustang dyno put out 310 with 360 I ran the plugs my question is I'm about to run the same E85 setup on my 18 would it be a waste of money to buy the step colder plug if I'm only going to yield low 300 whp?
    • 0 of 0 people found the following answer helpful

      A:  If you are 310 at the wheels you would have more at the crank so these would be a good upgrade for your build

      Devan M. @ RallySport Direct 13 days ago  
        
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  • Q: 2007 subaru wrx sti turbo  Mike14 days ago

    My car is pushing 315 hp 350 tourqe whould these plugs be adequate.
    • 0 of 1 people found the following answer helpful

      A:  Step colder plugs will dissipate heat more efficiently, which will bring down combustion chamber pressures and prevent pre-detonation. They are not recommended for stock or close to stock power vehicles because the cylinder temps do not get hot enough, which can cause carbon buildup on the plugs. Higher powered vehicles produce the heat to burn these deposits off. Your vehicle will not have enough power to recommend these.

      Devan M. @ RallySport Direct 14 days ago  
        
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  • Q: Recommended for stage 2 wrx?  Cornbread19 days ago

    I have an 08 wrx with an invidia turboback exhaust and cobb stage 2 tune. will these work well in that application or should i stick with the oe spec plugs
    • 0 of 0 people found the following answer helpful

      A:  Step colder plugs will dissipate heat more efficiently, which will bring down combustion chamber pressures and prevent pre-detonation. They are not recommended for stock or close to stock power vehicles because the cylinder temps do not get hot enough, which can cause carbon buildup on the plugs. Higher powered vehicles produce the heat to burn these deposits off. Your vehicle will not have enough power to recommend these.

      Devan M. @ RallySport Direct 17 days ago  
        
      Was this answer helpful?
  • Q: stock wrx  shawn1 month ago

    will these work with my stock 2011 wrx ?
    • 0 of 0 people found the following answer helpful

      A:  Step colder plugs will dissipate heat more efficiently, which will bring down combustion chamber pressures and prevent pre-detonation. They are not recommended for stock or close to stock power vehicles because the cylinder temps do not get hot enough, which can cause carbon buildup on the plugs. Higher powered vehicles produce the heat to burn these deposits off. Your vehicle will not have enough power to recommend these.

      Devan M. @ RallySport Direct 1 month ago  
        
      Was this answer helpful?

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2012 Subaru Impreza WRX STI Limited Sedan
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