SYKRSS 8-Pack DG521 Ignition Coils + SP509 Iridium Spark Plugs for Ford/Lincoln 4.6L-5.4L

Why choose the SYKRSS 8-Pack DG521 & SP509 ignition kit

The SYKRSS kit combines eight DG521 ignition coils with eight SP509 iridium spark plugs, created to support typical V8 and V10 powertrains found in popular Ford and Lincoln models from the late 2000s. This pairing is designed to provide a cohesive replacement path that aligns with OE-style performance while focusing on durability in demanding engine bays. Expect components engineered to handle heat and high electrical demand, with attention to precision fit and straightforward installation. By addressing common ignition wear with a single, coordinated kit, you can simplify routine maintenance and keep ignition parts working in tandem for more consistent starts and dependable operation across driving conditions.

The coils are built with heat-resistant materials intended to withstand engine heat, helping to maintain spark delivery across a broad range of temperatures. The SP509 iridium plugs are selected for stable ignition performance and durable electrode wear resistance, which can support steady combustion over time. While results can vary by vehicle and driving style, this kit is designed to offer a practical, integrated upgrade for compatible models.

Compatibility at a glance

• Ford F-150 2008-2010 5.4L V8
• Lincoln Mark LT 2008 5.4L V8
• Ford Expedition 2008-2009 5.4L V8
• Lincoln Navigator 2008-2009 5.4L V8
• Explorer Sport Trac 2008-2010 4.6L V8
• F-250/F-350 Super Duty 2008-2010 6.8L V10
• Ford Mustang 2008-2010 4.6L V8
• Mercury Mountaineer 2008-2010 4.6L V8
• Ford F-450/F-550 Super Duty 2015-2016 6.8L V10

What’s included

• Ignition coil packs: eight
• Spark plugs: eight SP509 iridium
• Manual: one quick-start guide

Quality, installation and performance

Designed to meet or exceed OE standards, the kit emphasizes form, fit and function. The components are intended for fast, direct installation and reliable operation across engine speeds. The aim is to deliver consistent spark power and ignition reliability, enabling smooth transitions through varying driving scenarios.

Strict quality checks support dependable performance, and a coordinated replacement approach helps ensure compatibility between the coils and plugs. While the kit is built to suit a range of common configurations, always confirm the year, make, model and OE numbers before purchase. The brand offers ongoing support to address fitment questions and installation inquiries.

Usage scenarios and outcomes

Potential benefits may include quicker ignition, better spark energy, and steadier starting behavior in daily driving and heavier loads. Per-vehicle results depend on a variety of factors, including existing ignition system conditions and overall engine health. Users should view these possibilities as achievable outcomes rather than guaranteed results.

Before buying, verify the coil OE number DG521 and spark plug OE SP509 to ensure compatibility with your build. SYKRSS customer support is available for questions about fitment or installation.