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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.
Motrudboy
Ngk plugs are top of the line, one step colder works great with 400whp on my Sti.
1 of 1 people found the following review helpful
Condor 303
Great product and great performance for my STI.
stijbr291639
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.....
Massayute
Yup, I love it. Everything is perfect, no issues thanks !!!!
Cgm_sti
Fit these plugs on my 05 sti, gap was correct when they arrived, packaged well. No spark blowout at 415hp! Fast shipping as always!
Scoobi Snack
I have never had an issue even when burning rich, lean, or oil they keep fiering.
Wrx
Nothing really to complain about, install was a little difficult, but there are good forum posts and videos of the installation. For the 2012 you must take off the intake battery and air pump to access the spark plugs. But started up perfect and nothing bad but for the first few miles my throttle response felt different and I almost stalled but got over it in 10 miles
1 of 1 people found the following review helpful
tylertc
Work great. Installation note: There's plenty of YouTube videos - but I also found that when you get the coilpack unbolted, rotate it 180 degrees which will then allow you to get it past the unibody or "frame rails" much much easier.
Drew.McD
Great plugs. My 05 LGT was throwing a p0301 (misfire) code. Determined there was a chance it was the plugs, and the cheapest route to go, and sure enough, after receiving these and an hour and a half install, the car ran sooo much better than before.
1 of 1 people found the following review helpful
05OBXTVF52E85BBQ
I replaced my worn out stock heat range Denso Power plugs with these and am satisfied with the results. Any time you replace worn out plugs your idle will smooth out and these were no exception. My car is making 300whp/360wtq and I see no signs of fouling after 5000 miles.
michael.sutphen61953
Install wasn't too bad, driver side rear was the most difficult. The funny thing is that my car seems to be tad quieter after I installed these plugs. Wierd? But they work great!!
awangard.motors35013
Great product by NGK , cant tell much difference , changed them while building up my motor
awdturbowrx
Great product from NGK, nothing less expected.
Jordan Daniels
Pre gapped plugs. Worked as advertised.
jghost
Used on a protuned 06 legacy gt. Helped keep egt in check and fit perfect!
darkmoonkhan313
Went 32k and changed last set on mod'ed REX. TOASTED, not saying they didnt last just if your running above the stock power levels watch your electrodes. I will now be changing every 25k! 290WHP 315 FT-LBS
0 of 1 people found the following review helpful
Lambinoalphonse31681
The only dowside on the plugs are the pregaps. It stated that each one has a gap of .032 but when I measured it, it was .027-.029 same as the oemplugs that i took out from my engine.
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