Ford Performance Cold Spark Plug Set Focus ST 2013-2018/Focus RS 2016-2018

Ford Performance:
M-12405-20T
Ford Performance Cold Spark Plug Set Focus ST 2013-2018/Focus RS 2016-2018 is rated 4.9 out of 5 by 8.
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Highlights

  • 2 Heat Ranges Colder Than OE
  • Comes Pre Gapped
  • Allows For Increased Boost
  • Sold As A Set Of Four
MSRP $91.00
$81.99
You save 10%

Set of Ford Performance Cold Spark Plugs for 2013, 2014, 2015, 2016, 2017 and 2018 Focus ST and 2016, 2017 and 2018Focus RS.

When upgrading your 2013-2018 Focus ST or 2016-2018 Focus RS with more modifications it may become necessary to upgrade the spark plugs as well. As the cylinder combustion pressures increase, a colder spark plug may be required. This means adding more boost will require colder spark plugs.

The spark plugs in this set are two heat ranges colder than the stock EcoBoost engine spark plugs. They are the same spark plugs that are included with the Ford Performance Calibration Kit (M-9603A-FST).

Sold as a set of four spark plugs. They come pre-gapped to 0.028-inch (0.71mm).

A colder spark plug does not mean the spark plug uses less voltage or produces less electrical energy. The heat range of a spark plug is the range in which the spark plug works well thermally. The main difference that affects the heat range is the length of the insulator nose. A hotter spark plug has a longer insulator nose and a colder plug has a shorter insulator nose. A longer insulator nose means the path for heat dissipation from the insulator nose to the cylinder heat is longer and the firing end stays hotter. Also, more surface area is exposed to the ignited gases so the spark plug is easily heated to higher temperatures. A colder spark plug functions in the opposite manner.

Using spark plugs with too hot of a heat range may result in detonation. If too cool of a heat range is used, the spark plugs may foul.

Order this Set of Ford Performance M-12405-20T Cold Spark Plugs for your 2013, 2014, 2015, 2016, 2017 or 2018 Focus ST or 2016, 2017 or 2018 Focus RS from CJ Pony Parts today!

Installation Videos

Vehicle Fitment

This product will fit the following Focus years:

Rated 5 out of 5 by from Excellent Just installed, I was actually really surprised at the improved throttle response and power increase.
Date published: 2015-12-06
Rated 5 out of 5 by from Ford Performance Cold Spark Plug Set Focus ST 2013 Yep, bought them for both the wife's and my 2017 Focus RS. Immediate notice in idle and overall responsiveness of both vehicles. Highly recommend, especially if you are tuning.
Date published: 2018-11-19
Rated 5 out of 5 by from Nice Its a spark plug that does what it supposed to do at a very high level of performance.
Date published: 2015-10-19
Rated 5 out of 5 by from Great The best spark plugs for the ST better throttle response and very smooth idle
Date published: 2018-02-16
Rated 5 out of 5 by from Spark plugs Got this for Christmas Easy install quality product
Date published: 2015-01-15
Rated 4 out of 5 by from Great Product Easy to install and do yourself with only a couple tools. I had to adjust the gap of one of the spark plugs but the other ones came pre gapped perfectly. I had a 2mpg increase immediately too.
Date published: 2019-05-01
Rated 5 out of 5 by from Night and day diffenrce The biggest difference spark plugs are amazing I deff recommended these plugs
Date published: 2017-01-25
Rated 5 out of 5 by from Haven't installed them yet Get back to you on that, too short is that politically correct
Date published: 2018-12-17
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would these work with the cobb accessport.

Asked by: Orion956
Only if the tune you are using requires the use of a colder plug.
Answered by: rk cjpp
Date published: 2019-08-26

Do you need the ford calibration to run these spark plugs or no? 

Asked by: Cpalm1480
You would need a tune that uses colder spark plugs or a custom tune.
Answered by: rk cjpp
Date published: 2019-08-14

I have full bolt ons, as well as the cobb stage3 map tune. Will this tune work with these colder spark plugs and what gap is recommended with a FBO tuned ST?

Asked by: King_of_ford
You will need a tune to run the colder plugs.
Answered by: rk cjpp
Date published: 2019-07-12

I understand you need a tune for these plugs, but if i was only going 1 step colder would i still need a custom tune? Currently running Cobb OTS stage 3 91oct. Thanks

Asked by: Campbell1733
Yes.
Answered by: rk cjpp
Date published: 2019-07-12

I'm using The MSD coil packs in my 2015 focus st. I have, Roush intake,Depo intercooler, turbosmart Bov, and Tsudo fatback. Can I run a colder spark plug?

Asked by: michael3609
You will need a tune for a colder spark plug.
Answered by: rk cjpp
Date published: 2019-07-09

Do you recommend switching to these if I go from a 93 tune to an e30 tune

Asked by: Stjames
The colder plugs require a tune.
Answered by: rk cjpp
Date published: 2019-07-01

Can you use these spark plugs with out any tune or upgrades?

Asked by: Sean
These would require a tune.
Answered by: rk cjpp
Date published: 2019-06-27

I have 2013 Ford Focus ST and I have a custom tune on the dyno and i have dp and intake installed would I need my car to be tuned again if I get these spark plugs?

Asked by: Devin00
I just talked to stratified tuning about getting a re tune for spark plugs they said no you don't need to get a re tune for spark plugs.
Answered by: AZST
Date published: 2019-05-02
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