Will this work on a 2015 ford taurus sho 3.5l ecoboost?

Yes, I have them certainly installed in my 2015 Taurus SHO. They came gapped perfectly at .030 which is the latest recommendation for the 3.5 ecoboost.

Are these already properly gapped ?

F150 ecoboost are supposed to be at 28 so always double check

Will these fit my 2016 expedition with the 3.5 turbo eco boost? and will they come pre gapped?

Yea they will fit and noticed they are pre gapped to .28-.30

Are these the original sp542 ? Or the new replacement?

Yes these are the SP542 plugs. Ford discontinued the 542s and went with the performance version only now. The markings on the 542s and these plugs are exactly the same.

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Ford Racing (M-12405-35T) 10-17 Flex 3.5L EcoBoost Cold Spark Plug Set

Ford Racing (M-12405-35T) 10-17 Flex 3.5L EcoBoost Cold Spark Plug Set

Product ID: 186808089

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Details

Brand
Ford
Core Material
Copper
Thread Size
M14x1.25
Top Material Type
Nickel
Vehicle Service Type
Car

🔥Copper Core for Optimal Conductivity

⚙️Precision M14x1.25 Thread Size

🛠️Vehicle-Specific Fit for Perfect Compatibility

Description

🔥 Ignite your drive with Ford Racing precision! ⚙️

PRECISION FITMENT - Custom-tailored for 2010-2017 Flex 3.5L EcoBoost engines—no guesswork, just perfect fit.
DURABLE COPPER CORE - Superior copper core ensures consistent spark and long-lasting ignition reliability.
LIGHTWEIGHT COMPACT - At just 13.4 ounces, these plugs deliver power without adding bulk.
RACE READY PERFORMANCE - Engineered by Ford Racing to maximize your EcoBoost’s power and efficiency.
NICKEL TOPPED EXCELLENCE - Nickel top material resists corrosion, maintaining peak performance mile after mile.

The Ford Racing M-12405-35T Cold Spark Plug Set is a vehicle-specific ignition upgrade designed for 2010-2017 Flex 3.5L EcoBoost engines. Featuring a copper core for superior conductivity, nickel top for corrosion resistance, and precision M14x1.25 threading, these plugs ensure optimal engine performance, reliability, and longevity.

Specifications

Brand	Ford
Core Material	Copper
Thread Size	M14x1.25
Top Material Type	Nickel
Vehicle Service Type	Car
Automotive Fit Type	Vehicle Specific Fit
UPC	756122008324
Manufacturer	Ford Racing
Model	Ford M-12405-35T
Item Weight	13.4 ounces
Product Dimensions	10.75 x 4.5 x 4.5 inches
Item model number	M-12405-35T
Is Discontinued By Manufacturer	No
Exterior	Painted
Manufacturer Part Number	M-12405-35T

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