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Micki94
Reviewed in Germany on June 9, 2024
Habe die zum ersten mal, sind aber echt gut.
Customer
Reviewed in the United States on November 13, 2022
A pesar que que amazon dice que estas bujias no son para mi carro , les confirmo que si lo son y ha mejorado mucho el rendimiento, son excelentes,
Vittorio
Reviewed in Italy on April 26, 2021
Acquistate per sostituirle in un motore 1.6 GPL. Perfettamente compatibili con le originali. Avvitate e serrate come indicato sulla scatola. L'avviamento del mezzo è stato immediato e senza incertezze nel girare da fermo. L'utilizzo in percorrenza è stato perfetto. Tutto bene. Verificherò la durata kilometrica.
Customer
Reviewed in the United States on July 15, 2019
Fits 2015 Ecoboost Mustang. One step colder than stock. Cleaned up a stuttering I had at full throttle acceleration. Factory gaps seemed a bit all over the map.
Dan Hoeks
Reviewed in the United States on August 23, 2018
These are the 1 step cooler than stock rating and I have been using these on my Focus ST with an OTS Cobb Stage 1 tune, stock intercooler, and a green filter. I've had them on for about 15,000 miles and they have been performing well. Minimal corrections when monitored and my car runs well with them.
terry white
Reviewed in the United Kingdom on October 7, 2017
Bought these for a mountune modified 2014 Fiesta ST. Since install i have noticed a smoother idle and smoother acceleration pattern
JF
Reviewed in the United States on April 10, 2017
Great plugs for a Mustang Turbo 2.3 liters ! Put them in my car better response and better fuel ⛽️ economy! Highly recommend make sure you Ck the gaps on all plugs and see recommendations from forums . I run 93 Octane and boost gauge went to 22 PSI . Cheap investment that you can feel a lot more responsive !
SilverFox
Reviewed in Canada on July 30, 2016
Convenient find. Great for stage2-3 upgrade for my MS3. Came gapped at 0.028". Verified, but double check if you get them. Last thing you want is something bad happening while fine tuning the engine.
Martin Couture
Reviewed in Canada on June 29, 2015
Great plugs and was pre gap to 0.030 and I sized it to 0.026. The delivery was fast and I used them for my mazdaspeed 3 and I had knock retard and now I have none.
A.Sperelli
Reviewed in the United States on November 23, 2015
I have a turbocharged Focus ST that is fully bolted and is putting down some decent power. One of the first things I did when I started more seriously modding it was to replace the stock spark plugs with these Denso Iridium, plugs that are one step colder.First of all, it's good to take out the stock spark plugs because they often are not gapped properly from the factory. Even though these Denso plugs come pre-gapped it's always good to check them before installing them, so that you know you are running the right gap for you engine and your setup.Also, when running more power than stock, it's always a good idea (and very cheap insurance) to run one step colder plugs. Anything more than that is not necessary unless a bigger turbo is installed. In fact, more than one step colder on an otherwise mostly stock car can even be counterproductive and may lead to the plugs fouling because they likely won't reach the right temperature to burn off deposits. One step colder is just right, and will help your engine to run smoother and possibly even with less knock.If you found my review helpful, please click 'yes' below, I would really appreciate it!
ian
Reviewed in the United States on August 23, 2014
Worked Great as a step colder plug for my 2014 Ford Focus ST, improved corrections via data logging. Amazon's pricing and shipping can't be beat! Highly recommend these to any ST owner's with a tune.
John Chestnut
Reviewed in the United States on October 22, 2014
I have a '14 Focus ST and since I had purchased a custom tune, I felt that these plugs were necessary to better handle the ECU adjustments. Although I haven't seen much of a change in mileage or power, the ride is much smoother and power delivery is great. My only precaution is to not use these on a completely stock vehicle. My ST rode a little rough before I had installed the tune. I would highly recommend these plugs to anyone with a custom tune.
chop66
Reviewed in the United States on April 3, 2014
Right now they are a 5 star solution. Have about 65K on the vehicle and was having some misfires and stutter. Swapped them out, they came pregapped from the factory and worked well. Immediate response, no more stuttering and power has been restored. Certainly will not know if they will last as long as advertised and 7 years seems unlikely. Hope to get upto 100K on them.Just wished Mazda had not opted to put the intercooler right on top of the plugs, made a simple job so much more compicated.
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