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NGK Iridium Spark Plug Set LTR71X-II
NGK Iridium Spark Plug Set LTR71X-II


Availability: Usually Ships in 24 Hours
Product Code: NGK-LTR71X-II

Spark Plug Gap:


NGK Iridium Spark Plug Set LTR71X-II

The EcoBoost engine operates under extreme conditions including high cylinder pressures. The spark plugs are subject to rapid wear rates, even at standard performance levels. Engines running higher boost points or increased levels of tuning can experience reduced spark plug life resulting in lower engine performance, misfires and rough idle. Increased wear is typically seen in the form of increased spark plug gap and degradation of the electrode. Using spark plugs that are optimized for increased power insures maximum performance. Includes pre-gapping by Mountune to optimized setting.

The NGK LTR71X-II is one step colder than the original spark plug and perfect for those running additional boost pressure and typical bolt on modifications.
Price is for a set of 4.


  • Focus ST 2013-2017
  • Focus RS 2016-2017

  • Smoother acceleration
  • Perfect for high boost street use
  • Pre-gapped by Mountune - Choose your application when ordering!


This part has been designed and is intended for off-highway application only. Installation of this part on a vehicle that is driven on public roads may violate U.S. and Canadian laws and regulations relating to emission requirements and motor vehicle safety standards. Click Here for Emissions compliance information.

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Average Rating: 5 of 5 Total Reviews: 1 Write a review »

  2 of 2 people found the following review helpful:
Sparking May 24, 2017
Reviewer: Richard from New York  
I ordered these for my RS and the difference from stock is noticeable. Idle is smoother and high RPM power also seems better.
Order these without regret.

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