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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⚡ Ignite your EcoBoost’s true potential with Ford Racing precision!

RACE READY IGNITION - Experience peak spark performance engineered by Ford Racing for your EcoBoost engine.
DRIVE WITH CONFIDENCE - Trust Ford Racing’s OEM quality to keep your vehicle running cooler, cleaner, and more powerfully.
PERFECT FIT GUARANTEE - Designed specifically for 2010-2017 Flex 3.5L EcoBoost models to ensure seamless installation and optimal function.
DURABLE TRIPLE LAYER DESIGN - Innovative three-layer structure protects your engine’s interior while boosting reliability and longevity.
BOOST YOUR RIDES EFFICIENCY - Enhance combustion for smoother acceleration and improved fuel economy—because every millisecond counts.

The FordRacing M-12405-35T Cold Spark Plug Set is a high-performance ignition upgrade tailored for 2010-2017 Flex 3.5L EcoBoost engines. Featuring a durable three-layer design and exact vehicle-specific fitment, these spark plugs optimize combustion efficiency, improve fuel economy, and ensure reliable, race-inspired performance for your daily drive.

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Manufacturer	Ford Racing
Brand	Ford
Model	Ford M-12405-35T
Product Dimensions	27.31 x 11.43 x 11.43 cm; 381 g
Item model number	M-12405-35T
Exterior	Painted
Manufacturer part number	M-12405-35T
Item Weight	381 g

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

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