DG508 Ignition Coil Pack & SP479 Iridium Spark Plug Set - Performance

In this review the DG508 ignition coil pack paired with SP479 iridium spark plugs is presented as a full tune-up option for Ford 4.6L and 5.4L V8 owners. The bottom line: this kit is for drivers who want a cost-effective way to eliminate misfires and restore smooth idle and throttle response without custom work. The reviewer found the set delivers concrete improvements in ignition stability and longevity because it replaces all eight coils and plugs with direct-fit parts engineered to handle high heat and prolonged service.

Key Features

• Complete tune-up set: Includes eight DG508 ignition coils and eight SP479 iridium spark plugs so you can replace the entire ignition bank in one job for consistent performance across cylinders.
• High-performance iridium plugs: SP479 iridium tips provide a stable, precise spark that supports fuel efficiency and improved combustion compared with standard copper plugs.
• Wide vehicle compatibility: Designed for Ford 4.6L and 5.4L V8 engines and listed to fit models such as F-150, F-250, F-350, Expedition, Crown Victoria, Mustang, and Lincoln Navigator.
• Durable construction: Coils are built with heat-resistant materials and strong insulation to resist cracking and misfiring under heavy use, extending service life.
• Easy installation: Each coil and plug is engineered as a direct OEM replacement with pre-gapped plugs and coil boots for a snug fit without modification.

Who It's For

This kit is aimed at owners of Ford 4.6L and 5.4L V8 vehicles who want a straightforward, full-bank ignition refresh to correct misfires, rough idle, or reduced fuel economy. It is especially useful for DIY mechanics and independent shops that prefer replacing all eight coils and plugs at once to ensure uniform ignition performance.

Those who should look elsewhere include owners of non-compatible engines or anyone requiring OE-branded parts with factory warranty coverage specific to a dealer program; this aftermarket kit is intended as a performance-oriented, cost-effective replacement rather than a factory-labeled part.

Pros & Cons

Pros

• Direct-fit replacement for a full ignition bank, making a single service visit efficient and thorough.
• Iridium SP479 plugs offer better durability and stable spark under demanding conditions.
• Coils are heat-resistant and insulated to reduce the risk of cracking or premature failure.
• Pre-gapped plugs and coil boots simplify installation and reduce installation time.

Cons

• Aftermarket branding means warranty terms may differ from OEM dealer parts if factory-branded coverage is required.
• Some installers may prefer individually sourced OEM coils or plugs for single-cylinder repairs rather than replacing all eight at once.

Specifications

Kit contents	8 DG508 ignition coils and 8 SP479 iridium spark plugs
Compatible engines	Ford 4.6L and 5.4L V8
Compatible models	F-150, F-250, F-350, Expedition, Crown Victoria, Mustang, Lincoln Navigator
Replaces part numbers	DG457, DG472, DG491
Spark plug type	Iridium SP479, pre-gapped
Coil features	Heat-resistant construction and strong insulation

Our Verdict

The DG508 and SP479 set is a practical, value-focused upgrade for Ford 4.6L and 5.4L V8 owners who want reliable ignition performance and longer service life without the premium cost of dealer parts. It is a solid choice for full-bank replacements that restores smooth running and helps prevent misfires when installed correctly.

Frequently Asked Questions

Will this kit fit my 5.4L Mustang?
Yes, the kit is listed as compatible with Ford 5.4L V8 applications including Mustang models that use that engine family.

Are the plugs pre-gapped?
Yes, SP479 iridium spark plugs are supplied pre-gapped for straightforward installation.

Do the coils require modification?
No, the DG508 coils are engineered as direct OEM replacements with boots designed for a secure, snug fit without modification.