DETYI DG521 Ignition Coil and SP509 Spark Plug Set

DETYI DG521 Ignition Coil and SP509 Spark Plug Set combines ignition coils and spark plugs for listed V8 applications. The listing names several Ford and related vehicle models, but fit depends on the exact engine and vehicle configuration, so confirm the part numbers before ordering.

At a glance

The listed components are DG521 ignition coils and SP509 spark plugs, presented as a combined tune-up kit.
The listing names Ford F-150, Expedition, Explorer, F-250 and F-350 Super Duty, Mustang, Lincoln Navigator, and Mercury Mountaineer applications.
Vehicle fit is described as vehicle-specific, with DG521 and SP-509 part references.

Price

$62.99Save 10%

Reference price: ~~$69.99~~

Price checked: Nov 13, 2026

View offer

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Pros and cons

Pros

Combines ignition coils and spark plugs, which may suit buyers sourcing both component types for a compatible vehicle.
The listing provides model and interchange references that can help narrow fitment checks.

Technical specifications

3 specifications

Identity
Brand	DETYI
Model	Ignition Coil DG521 & Spark Plug SP509

Dimensions and installation
Weight listed	3.5 pounds

What to know before buying

Listing details to confirm

The listing describes a kit for V8 ignition systems and gives model-year ranges for some applications, but does not establish fit for every engine or trim. Match the listed part numbers and vehicle-specific fitment to your vehicle before purchase. Claims of OEM-equivalent quality, direct fit, improved throttle response, cleaner combustion, and fuel efficiency are listing claims, not independently verified outcomes.

What’s in the box

Included

Ignition Coil DG521
Spark Plug SP509

Who is it for?

A good fit for

Owners servicing a vehicle confirmed to use DG521 ignition coils and SP-509 spark plugs.
Buyers looking for a combined ignition coil and spark plug kit for a listed V8 application.

Less suited to

Buyers who have not confirmed the vehicle's engine and required part numbers.
Vehicles requiring a different ignition coil or spark plug reference.

DETYI DG521 Ignition Coil and SP509 Spark Plug Set · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.6 / 5 · 30 ratings

5 stars76%76%
4 stars14%14%
3 stars5%5%
2 stars0%0%
1 star5%5%

Customer feedback describes the coil pack's performance and quality positively, including a reported fit on a Ford F-150 with a 5.4L engine. That is encouraging for buyers with a matching application, but it does not establish compatibility across the listing's broader vehicle range. Ratings are mostly five-star with some lower ratings, so experiences are not uniformly positive.

Positive themes

Customer feedback mentions positive impressions of quality and performance.

Frequently asked questions

What components does the listing identify?

It identifies DG521 ignition coils and SP509 spark plugs. Confirm the package selected and its contents in the listing before ordering.

Which vehicles does the listing name?

It names Ford F-150, Expedition, Explorer, F-250 and F-350 Super Duty, Mustang, Lincoln Navigator, and Mercury Mountaineer. Fitment varies by application, so verify your engine and part numbers.

Is this a confirmed fit for every listed vehicle?

No. The listing describes vehicle-specific fit and notes that the named models are common applications using DG521. Check your exact vehicle and engine against the required references.