
31939-99C Comparison
| photo | price | summary | rating |
|---|---|---|---|
![]() | $57.99 | Condition is New, 99 - 08 Harley touring flht flhr screamin eagle 10mm spark plug wires 31939-99C, shipping cost = $13.00 | ![]() |
![]() | $59.99 | Condition is New, HARLEY NEW OEM Screamin Eagle 10mm Phat Spark Plug Wires TOURING 99-08, shipping cost = $12.00 | ![]() |
![]() | $67.99 | Condition is New, Harley Davidson Screamin Eagle 10mm Phat Spark Plug Wires TOURING 99-08 RED NEW, shipping cost = $5.99 | 99.7% |
![]() | $59.94 | Condition is New, HARLEY NEW OEM Screamin Eagle 10mm Phat Spark Plug Wires TOURING 99-08, shipping cost = $16.57 | 98.6% |

Introducing the Harley-Davidson 31939-99C Touring 99-08 FLHT FLHR Screamin' Eagle 10mm Spark Plug Wires, specifically designed for Harley-Davidson Touring models from 1999 to 2008 with FLHT and FLHR engines. These high-performance spark plug wires offer an upgrade to the original equipment, delivering improved ignition performance and reliability.
Crafted with 10mm diameter wires, these spark plug wires boast a greater conduction area than standard wires, enabling faster and more efficient transmission of the spark from the ignition coil to the spark plug. This results in a more complete combustion process and increased power output.
Manufactured using a premium, high-temperature resistant material, these spark plug wires ensure durability and resistance to wear and tear. The wires are also designed with a triple-boot insulation system that protects against electrical interference and voltage leakage, ensuring a consistent and reliable spark.
The Harley-Davidson 31939-99C Touring 99-08 FLHT FLHR Screamin' Eagle 10mm Spark Plug Wires feature a vibrant yellow color, adding a touch of style and visual appeal to your motorcycle's engine compartment. Installing these wires is a straightforward process, making it a popular choice among Harley-Davidson enthusiasts looking to enhance the performance of their motorcycle.
Upgrade your Harley-Davidson Touring model with the Harley-Davidson 31939-99C Touring 99-08 FLHT FLHR Screamin' Eagle 10mm Spark Plug Wires and experience the difference in power, reliability, and visual appeal.
Pros and Cons of Buying Harley-Davidson 31939-99C Touring 99-08 FLHT/FLHR Screamin' Eagle 10mm Spark Plug Wires
I. IntroductionHarley-Davidson's Screamin' Eagle 10mm spark plug wires are a popular aftermarket upgrade for Harley-Davidson motorcycles produced between 1999 and 2008 in the FLHT and FLHR models. These wires are designed to improve the ignition system's performance and provide better spark for improved engine performance. In this analysis, we will discuss the potential advantages and disadvantages of purchasing these spark plug wires.
II. Pros1. Enhanced Performance: The Screamin' Eagle 10mm spark plug wires can deliver a stronger spark, which can result in improved engine performance. This can lead to increased horsepower, torque, and overall riding enjoyment.
2. Durability: These wires are made from high-quality materials, ensuring they can withstand the harsh conditions of regular riding. They also come with a longer lifespan compared to stock wires, reducing the need for frequent replacements.
3. Improved Fuel Economy: A stronger spark can result in more efficient combustion, potentially leading to improved fuel economy. This can save riders money in the long run on fuel costs.
4. Better Spark Discharge: The 10mm spark plug wires provide a more consistent and reliable spark discharge, which can lead to a smoother ride and reduced misfires.
III. Cons1. Cost: The Harley-Davidson Screamin' Eagle 10mm spark plug wires are a more expensive option compared to stock wires. This can be a significant investment for some riders.
2. Installation Complexity: Installing the new spark plug wires can be a complex process, especially for those who are not familiar with motorcycle electrical systems. This may require professional installation or extensive research and time for a DIY installation.
3. Compatibility: Ensure that these wires are compatible with your specific Harley-Davidson model and year. Installing the incorrect wires can lead to electrical issues and reduced performance.
IV. ConclusionThe Harley-Davidson 31939-99C Touring 99-08 FLHT/FLHR Screamin' Eagle 10mm spark plug wires offer several advantages, including enhanced performance, durability, improved fuel economy, and better spark discharge. However, they also come with disadvantages, such as cost, installation complexity, and compatibility concerns.
Ultimately, whether or not to purchase these spark plug wires depends on the individual rider's priorities and budget. For those seeking improved performance and durability, these wires can be a worthwhile investment. However, for those on a tight budget or unwilling to invest in the installation process, the stock wires may be sufficient for their riding needs.
V. RecommendationFor riders looking for a noticeable performance improvement and a longer-lasting spark plug wire solution, the Harley-Davidson 31939-99C Touring 99-08 FLHT/FLHR Screamin' Eagle 10mm spark plug wires are an excellent choice. It is recommended to ensure compatibility with your specific motorcycle model and year and consider professional installation for optimal results.
Details:
1999 -2007 Harley-davidson Electra glide standard Flht. 1999 Harley-davidson Electra glide standard Flht.
specifications ignitiwire:
- for models: Touring, Flht, Flhr, Eagle
- for makes: Eagle
- for years: 1999–2008
- brand: Harley-davidson
- mpn: 31939-99c
- type: Ignition Wire Set
- connector type: Female
- insulation outside diameter: Se Oem
- material: High Temperature Silicone
- country/region of manufacture: Mexico
- universal fitment: Yes
- placement on vehicle: Rear
shipping ignitiwire:
- class: standard
- transit: 3-8 days
- service: standard
- type: fixed
offer ignitiwire:
- options: ship-to-home
- in stock #: 4
- started: march 17, 2025
- availability: in stock
- prices: $57.99–$67.99
- item condition: New
- sold #: 22
- best offers: true
general ignitiwire:
- category: Auto Parts > Car Truck Accessories > Systems Components > Ignition Wires Coil Boots
payments ignitiwire:
- other
- credit card: mastercard
- wallet: google-pay
seller ignitiwire:
- # reviews: 6788
- city: orlando, florida
- rating: 98.7%
returns ignitiwire:
- policy: returns accepted
- time: 30 days
- paid by: buyer
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