MAS Ignition Coil Kit & Motorcraft SP-509 Spark Plugs for Ford 4.6L/5.4L — 8 Coils with Brown DG521 Boots, Complete Bank Service

MAS delivers a complete 8-coil kit with brown DG521 boots plus eight Motorcraft SP-509 spark plugs to restore reliable ignition for Ford 4.6L and 5.4L V8 engines.

If your Ford Expedition, F-150, F-250, F-350, F-450, F-550, Navigator or compatible Lincoln/Mercury from the late 2000s to early 2010s is misfiring, rough at idle, or showing coil-related trouble codes, swapping the entire ignition pack at once is the most straightforward repair. This MAS set contains eight direct-replacement ignition coils featuring heat-resistant brown boots (DG521) and matching Motorcraft SP-509 spark plugs, packaged to simplify a full-banks service and help you avoid piecemeal failures later.

How do these coils and plugs match my original Ford parts?

These MAS coils are engineered for direct compatibility with late-2000s Ford/Dow vehicles using DG521 (brown) boots. They list multiple OE cross-reference numbers so you can compare to your factory parts. Always check your originals before ordering since Ford changed coil boot color mid-year on some models.

• Fits 4.6L and 5.4L V8 engines used in Ford and Lincoln applications
• Cross-references: C1659, DG521, FD-509, SP509 and other OEM numbers
• Includes Motorcraft SP-509 spark plugs specified for these engines
• Confirm boot color—brown (DG521) vs black (DG511)—before purchase

What performance and durability features are included?

MAS uses high-grade materials and a high-heat compound in the boot to withstand underhood temperatures and reduce premature breakdown. Each coil is tuned to deliver the energy levels expected by the factory ignition system, helping consistent spark delivery across all cylinders.

• High heat resistant on-plug boot compound for extended service life
• Designed for high-energy output to match factory ignition demands
• Quality control backed by a one-year limited coverage
• Complete set prevents mismatched component aging

How difficult is installation and what’s included in the package?

Installation is straightforward for anyone comfortable with routine engine maintenance: remove coil packs, pull old spark plugs, install new plugs and seat the coils. The kit supplies all eight coils with brown DG521 boots plus eight Motorcraft SP-509 plugs so you can replace the entire ignition bank in one job.

• Full set of 8 ignition coils with brown boots (DG521)
• Eight Motorcraft SP-509 spark plugs included
• Direct-replacement form and connector fit for listed vehicles
• No additional parts required for a standard coil-and-plug service

Which model years and vehicles will this kit fit?

This MAS kit targets a defined range of Ford platforms that commonly use the DG521 coil boots. Fitment covers many model years around 2008–2014 depending on model and production changes; always verify against your vehicle’s OEM part numbers or inspect an original coil boot color.

• 2009–2014 Ford Expedition and 2008–2014 Lincoln Navigator
• 2008–2010 Ford Explorer, Explorer Sport Trac and F-150
• 2008–2010 F-250/F-350 Super Duty, F-450/F-550, Mustang and others
• Compatible with 4.6L and 5.4L V8 engines

Who is this for? A single-purchase solution for owners, DIY mechanics, and independent shops who want a complete ignition bank refresh using a compatible coil boot variant (brown DG521) plus OEM-grade Motorcraft SP-509 plugs. If your vehicle’s OEM coils are brown-boot DG521 style and it runs a 4.6L or 5.4L V8, this kit streamlines replacement and reduces the risk of future cylinder misfires caused by aging coils or worn spark plugs.