SET YOUR CAR
FREE SHIPPING
On orders over $100
TALK TO A PARTS EXPERT
RALLYSPORT GUARANTEE
100% Money Back on Select Parts

NGK Iridium Spark Plugs One Step Colder 2309

MODEL # NGK LFR7AIX-GRP

$44.80


  • Q: Would these spark plugs fit my 2014 fiesta ST straight out of the box?  Andrew19 days ago

    would I be able to install these spark plugs myself without any altering to the vehicle of the plugs? Also would there be any cons of putting these in a stock car i plan to mod?
  • Q: 2017 Sti  Eulises28 days ago

    Would these be ok with a stage 2+ tune? Mods atm: catted Dp, intake, cobb 1050 injectors , ebcm & IAG Aos
  • Q: Spark Plugs  Subielover19991 month ago

    I see these spark plugs already come pre gapped to .31. Would i be able to lower the gap to .26-.29 ?
  • Q: NGK Spark plugs one step colder.  NGK spark plugs2 months ago

    So i have a 2006 sti basically full bolt on and built long block and i make 300whp and 345tq on mustage dyno and would u recommend these plugs and would i have to gap them?
    • 0 of 0 people found the following answer helpful

      A:  These plugs are a great option for you. Due to the plugs being iridium they come pre gapped.

      Jared A. @ RallySport Direct 2 months ago  
        
      Was this answer helpful?
  • Q: 2007 Subaru sti Cobb Stage 2  MarioHdz26262 months ago

    Would this work with the Cobb stage 2?
  • Q: Spark plugs   Daniel13 months ago

    Car was tuned on e85 with these plugs in, I decided to tune it back to 91 with those plugs in. I’m changing my plugs and was wondering if I should stick to these or change?
    • 0 of 0 people found the following answer helpful

      A:  It would depend on the power difference with that setup, always consult your turner before making any changes

      Devan M. @ RallySport Direct 3 months ago  
        
      Was this answer helpful?
  • Q: 2007 subaru wrx sti turbo  Jake3 months ago

    I have a 2007 subaru wrx sti that is rt tuned pushing 316 hp 362 torque it is currently running on 93 octane im just wondering if these plugs would be good
    • 0 of 0 people found the following answer helpful

      A:  Yes, with the power you are making you would benefit from a one step colder spark plug.

      Brady R @ RallySport Direct 2 months ago  
        
      Was this answer helpful?
  • Q: 2013 wrx pro   Stevveo3 months ago

    I’m reading these questins and not sure whether I would benefit from these, I have a 13wrx protuned with supporting mods 301whp and 347wtrq, is this something I would benefit from?
    • 0 of 0 people found the following answer helpful

      A:  One step colder plugs will dissipate heat better letting you run a bit more aggressive tune. It would be best to consult your tuner and see if the recommended tunning these with your build.

      Luis L. @ RallySport Direct 3 months ago  
        
      Was this answer helpful?
  • Q: Do I need a new tune?  Omar3 months 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 months ago  
        
      Was this answer helpful?
  • Q: Other than stock   subie doo4 months 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 4 months ago  
        
      Was this answer helpful?
  • Q: 2007 subaru wrx sti turbo  Mike4 months 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 4 months ago  
        
      Was this answer helpful?
  • Q: Recommended for stage 2 wrx?  Cornbread4 months 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 4 months ago  
        
      Was this answer helpful?
  • Q: stock wrx  shawn4 months 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 4 months ago  
        
      Was this answer helpful?
  • Q: Iridium spark plug  NinjaGil5 months ago

    NGK Iridium Spark Plug One Step Colder Just got done doing a full built Ej25 putting everythjng together now. 700hp rating... will this spark plug one step colder will be the ideal to run for a break in or just stay with the oem ngk's until the break in is done. Then run the one step for tuning?
    • 0 of 0 people found the following answer helpful

      A:  It is recommended to go one step colder for every 100 hp you add over stock ratings, so with that power level you should definitely consider a two step colder plug.

      Devan M. @ RallySport Direct 5 months ago  
        
      Was this answer helpful?
  • Q: 2013 Wrx hatchback Cobb Stage 1+ power tuned   boxerengine116 months 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 6 months ago  
        
      Was this answer helpful?
  • Q: Can I use these?   John F7 months 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 6 months ago  
        
      Was this answer helpful?
  • Q: Worth getting retune after install  Case7 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 7 months ago  
        
      Was this answer helpful?
  • Q: Worth getting retune after install  Case8 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 7 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  John10 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 9 months ago  
        
      Was this answer helpful?
  • Q: E90 335.   Bmw425611 months ago

    I have an 08 bmw335i w n54 motor. Catless dp, dual cone intakes, stage 1 fuel it lpfp, vrsf fmic, stett charge pipe w tial bov, jb4 w mhd backend flash running e60. Buddy w similar setup was at 430whp and 470 ft/lbs. Would these be the way to go?
    • 0 of 0 people found the following answer helpful

      A:  These spark plugs are not confirmed to fit your car. These are Subaru 2004+ STI / 2006-2014 WRX engines.

      Karsten B. @ RallySport Direct 9 months ago  
        
      Was this answer helpful?
  • Q: Why exactly do you need/want one step colder plugs?  DaveC25312 months ago

    I know every 100hp gain you should go 1 step colder. But why? I never grew out of that stage as a toddler, I just like to know why I am doing something on my car.
    • 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.

      Marcus E. @ RallySport Direct 9 months ago  
        
      Was this answer helpful?
  • Q: misfiring  Landon1 year ago

    i have an 2016 sti 27k . currently running stage 3 + flex fuel and making 290whp at 333tq. im having a misfiring issue. code P0300, 304 ( misfire on random/multi cyls and cyl #4). the idle is rough and goes up and down at cold start. misfiring mostly occurs when im driving in high gears at low speed ( 6th gear at 50mph in local). i contacted the tuner and he sent me another map but misfiring still going on. brand new injectors, fuel filter, no vacuum leaks. so do you think it would be the spark plugs? if so then should i get the one step colder or stock heat range? thanks in advance!
    • 0 of 0 people found the following answer helpful

      A:  It's hard to say 100% what would be causing your issues. However, if you are experiencing any type or misfire then changing the spark plugs would be a good starting point. But in deciding on which spark plugs to go with, I would consult your tuner on deciding which one would be best fit your Vehicle and it's setup.

      Josh C.
        
      Was this answer helpful?
    • 0 of 0 people found the following answer helpful

      A:  Says its been 4 months since you posted so not sure if you still have an issue but I have had some friends with similar issues. Starting with the plugs is good and if that doesn't do it then I would do the coil packs next. Or you could do them both at the same time since its a pain and a half on Subies to get to them.

      Bald Eagle @
        
      Was this answer helpful?
  • Q: tune needed?  Landon1 year ago

    im running flex fuel with some mods and a dyno tuned, making 290whp and 330wtq. at cold start, the idle is rough and keeps going up and down, and its lagging if the car is not completely warmed up. check engine light comes on sometimes when driving in 6th gear at around 50mph in local. code :P0300 P0304 misfiring on multiple cyls and cyl #4. the tuner sent me a new map but it happens still. so do you think that it could be the sparkplugs and these plugs could solve the problem?
    • 0 of 0 people found the following answer helpful

      A:  It's hard to say 100% what would be causing your issues.. However, if you are experiencing any type or misfire then changing the spark plugs would be a good starting point.

      Brady R @ RallySport Direct 10 months ago  
        
      Was this answer helpful?
  • Q: Outback XT  MOBBINOBXT1 year ago

    Will these work on a 08 OBXT? Its almost identical to the Legacy GT. Not sure what the difference would be.
  • Q: Colder plugs?  villagebmxer375731 year ago

    My car wasn’t tuned on colder plugs, but I’m just wondering if these would be a wiser and better for a 2005 sti a little over 300whp. Tuned on 91, headers, cat less downpipe, full exhaust, intake, intercooler, 16gxt turbo, turbo inlet, and 850cc injectors. Figured they would work well until the next motor build. Wanted to know what you way more experienced guys think? Thanks for the time.
  • Q: spark plugs  Jim1 year ago

    Can I use these if my car is stock with no mods?
    • 0 of 0 people found the following answer helpful

      A:  NO, do not run these in a stock vehicle. If you think you need one step colder spark plugs you will need to consult your tuner for additional info.

      Tyler A. @ RallySport Direct 1 year ago  
        
      Was this answer helpful?
  • Q: 2008 wrx stage 1 aem intake   rockyco619711 year ago

    Would these be perfect for my 08 currently just on Cobb ap running aem 91 stage 1
    • 0 of 0 people found the following answer helpful

      A:  The general rule of thumb on colder spark plugs, is for every +100HP = 1 Step Colder Spark Plug. So if you are making 100HP over stock, then these spark plugs would be a good option.

      Brady R @ RallySport Direct 1 year ago  
        
      Was this answer helpful?
  • Q: Stage 2 Outback XT  alexmOBXT1 year ago

    I have a stage 2 outback XT with a full 3" turbo back and catless uppipe. I plan on getting a protune soon. Can I use these plugs?
    • 0 of 0 people found the following answer helpful

      A:  I would suggest not running these plugs. You will need to consult your tuner about running these.

      Tyler A. @ RallySport Direct 1 year ago  
        
      Was this answer helpful?
  • Q: Can i run these spark plugs   Paradise_171 year ago

    I have a 2010 wrx pushing. 285whp and 342lbs torque at leatest thats what the dyno says so would these be okay to run or which ones should i use
  • Q: Applicable for..  Larry 1 year ago

    Will this work for a 16 WRX with Air intake, Full turbo back exhaust, TGV, EGR Deletes, EBCS, Charge Pipe and Top Mount Intercooler pushing around 305/315 hp?
    • 0 of 0 people found the following answer helpful

      A:  Consult your tuner for any questions regarding upgrading your spark plugs if you are unsure.

      Tyler A. @ RallySport Direct 1 year ago  
        
      Was this answer helpful?