NGK Iridium Spark Plugs One Step Colder 2309 - Subaru EJ25 Turbo Models (inc. 2004+ STI / 2006-2014 WRX)
Manufacturer Part # LFR7AIX-GRP
Bundle Savings:MSRP: $73.24
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
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jghost 1 month ago
Used on a protuned 06 legacy gt. Helped keep egt in check and fit perfect!
Motrudboy 2 months ago
Ngk plugs are top of the line, one step colder works great with 400whp on my Sti.
2 months ago
Condor 303 5 months ago
Great product and great performance for my STI.
Ngk iridium 2309 one step cold spark plugs
stijbr291639 8 months ago
If your running a stage 3 plus protune it's worth getting one step colder spark plugs for high boost applications. It's a great product. This is my second pair. I change them out arround 6k. The install process was a little difficult but not impossible.. But the plugs are worth it in the long run.....
QUESTIONS & ANSWERS
Q: Why exactly do you need/want one step colder plugs? DaveC253 3 months agoAnswer
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.
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. 11 days ago
Q: misfiring Landon 3 months agoAnswer
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!
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. 1 month ago
Q: tune needed? Landon 3 months agoAnswer
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?
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 1 month ago
Q: Outback XT MOBBINOBXT 3 months agoAnswer
Will these work on a 08 OBXT? Its almost identical to the Legacy GT. Not sure what the difference would be.
A: Yes, this will work on your Outback XT.
Luis L. 2 months ago
Q: Colder plugs? villagebmxer37573 3 months agoAnswer
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.
A: These would be good for your setup, and would not require a re-tune.
Marcus E. 3 months ago