The Ford Performance M-12405-35T Cold Spark Plug Set is a direct-fit, high-quality ignition upgrade engineered for the Ford F-150 and Raptor EcoBoost 3.5L engines. Designed for higher-boost and tuned applications, these performance spark plugs feature a colder heat range and premium iridium construction that improve combustion stability under high cylinder pressures, helping reduce misfires and spark blowout often seen with stock plugs in performance builds. Sold as a complete set of six, they install easily with factory coil packs and deliver more consistent burn, stronger throttle response, and improved efficiency during hard driving or extended high-rpm use. These plugs are a straightforward, value-packed upgrade for any enthusiast looking to support additional power and reliability in demanding conditions.

Fitment Notes

• Designed for Ford F-150 2.7L (2018-2020) and Raptor 3.5L (2017-2025) EcoBoost engines (direct-fit replacement) 
  

• Works with stock ignition coils and factory plug wells — no special adapters required

• Ideal for tuned or high-boost engines where stock plugs are prone to misfire or spark blowout

• Not vehicle-specific for non-EcoBoost engines

Included

• 6 x Ford Performance Cold Spark Plugs (M-12405-35T)

• Pre-installed iridium tips

• Standard-reach design for EcoBoost engines

Product Specs

• Part Number: M-12405-35T

• Plug Type: Cold-range iridium spark plug

• Heat Range: One step colder than OEM

• Tip Material: Iridium for long life and consistent spark

• Recommended Gap: .026-.028

• Thread: 14 mm standard reach for EcoBoost heads

• Quantity: Set of 6 plugs

• Torque Specs: 11.1 ft-lbs

Product Features

• Performance-Oriented Heat Range: Colder plugs help disperse heat more effectively under high-boost/tuned conditions, reducing the chance of detonation and misfire. 

• Premium Iridium Tips: Provide a stronger, more consistent spark and longer service life than standard plugs.

• Improved Combustion Efficiency: Better burn characteristics enhance throttle response and help support increased performance builds.

• Direct Fit OEM Replacement: Engineered to fit without adapters or modifications, making installation straightforward.

• Ideal for Tuned Trucks: Recommended upgrade when adding power levels beyond stock or during aggressive driving. Replace every 15,000-20,000 miles on tuned applications.

• Long-Lasting Performance: Iridium construction stands up to frequent heat cycles and extended use.