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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: )
Community Media
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 | 58 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 2 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  2 months ago
Jordan Daniels
Pre gapped plugs. Worked as advertised.
  
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Good plugs 5 months ago
jghost
Used on a protuned 06 legacy gt. Helped keep egt in check and fit perfect!
  
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Fast shipping  6 months ago
Motrudboy
Ngk plugs are top of the line, one step colder works great with 400whp on my Sti.
  
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 6 months ago

  
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QUESTIONS & ANSWERS

  • Q: 2013 Wrx hatchback Cobb Stage 1+ power tuned   boxerengine111 month ago

    my 2013 subaru wrx hatchbacks only mod is cobb sf intake and invidia catback exhaust and the ecu is tuned with the access port from cobb which is at stage 1+ power. will these be fine from the oem spark plugs that i have on?
    • 2 of 2 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?
  • Q: Can I use these?   John F1 month ago

    Can I use these kind of spark plugs for my stock 2014 subaru wrx sti? I got a code from my obd scanner and it says that the code is p0303 misfire. And it has a rough idle too. Would you guys recommend me these kind of spark 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.

      Devan M. @ RallySport Direct 1 month ago  
        
      Was this answer helpful?
  • Q: Worth getting retune after install  Case2 months ago

    Q: Worth getting retune after install Case 2 days ago Answer My car was protune with the original spark plugs. Would it be worth it to get a retune after install A: You wouldn't need a re-tune after installing these. Marcus E. 2 hours ago 0 0 I know it wouldn't require a retune, but if I did get a retune, would I get any gains? ie timing adv because of a cooler cyl?
    • 0 of 0 people found the following answer helpful

      A:  You would not see anything noticeable with a retune, if there are any changes it won't require a retune to see them.

      Devan M. @ RallySport Direct 2 months ago  
        
      Was this answer helpful?
  • Q: Worth getting retune after install  Case2 months ago

    My car was protune with the original spark plugs. Would it be worth it to get a retune after install
    • 0 of 0 people found the following answer helpful

      A:  You wouldn't need a re-tune after installing these.

      Marcus E. @ RallySport Direct 2 months ago  
        
      Was this answer helpful?
    • 0 of 0 people found the following answer helpful

      A:  I know it wouldn't require a retune, but I did get a retune, would I get any gains? ie timing adv because of a cooler cyl?

      Case @
        
      Was this answer helpful?
  • Q: stock sti  John5 months ago

    i have a 2012 wrx sti. bone stock would i need a tune with these 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.

      Devan M. @ RallySport Direct 3 months ago  
        
      Was this answer helpful?

This Part Fits

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2014 Subaru Impreza WRX Premium Hatchback
WRX Premium Sedan
2010 Subaru Impreza WRX Premium Sedan
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2012 Subaru Impreza WRX Premium Sedan
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WRX STI
2004 Subaru Impreza WRX STI
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WRX STI Hatchback
2008 Subaru Impreza WRX STI Hatchback
2009 Subaru Impreza WRX STI Hatchback
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WRX STI Limited Sedan
2011 Subaru Impreza WRX STI Limited Sedan
2012 Subaru Impreza WRX STI Limited Sedan
2013 Subaru Impreza WRX STI Limited Sedan
2014 Subaru Impreza WRX STI Limited Sedan
WRX STI Sedan
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2010 Subaru Impreza WRX STI Special Edition Hatchback
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2008 Subaru Impreza WRX Sedan
2009 Subaru Impreza WRX Sedan
2010 Subaru Impreza WRX Sedan
2011 Subaru Impreza WRX Sedan
2012 Subaru Impreza WRX Sedan
2013 Subaru Impreza WRX Sedan
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WRX TR
2006 Subaru Impreza WRX TR
2007 Subaru Impreza WRX TR