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  3. DR JEKILL MR HYDE 66737-10

DR. JEKILL MR HYDE 66737-10 Exhaust Header Muffler Kit 4189

fits model: Softail. make: Harley. year: 2012.

66737-10 Dr. Jekill & Mr Hyde 2012 Harley Softail And Electronic Exhaust Header Muffler Kit #4189

( Brand: Dr. Jekill Mr Hyde ), ( Manufacturer Part Number: 66737-10 ), ( Type: Exhaust Headers ), ( Country Of Origin: United States )

Review DR. JEKILL MR HYDE Harley And Electronic Exhaust Header Muffler Kit #4189 fits SOFTAIL 2012

Introducing the Jekill & Hyde 66737-10 Harley-Davidson Softail Exhaust Header Muffler Kit, a high-performance aftermarket solution designed to enhance the power and aesthetics of your Harley-Davidson Softail motorcycle. This exhaust system is a direct replacement for the stock exhaust, allowing you to upgrade your bike with minimal installation effort.

The 66737-10 kit consists of a set of high-flow header pipes and mufflers. The headers are crafted from 304 stainless steel, known for its strength, durability, and resistance to corrosion. The header design is engineered to provide optimal exhaust scavenging, ensuring efficient combustion and increased engine performance. These headers are also CNC machined to ensure a precise fit and perfect alignment.

The mufflers in this kit are also made from 304 stainless steel, ensuring they match the durability and corrosion resistance of the headers. The mufflers feature a unique design that maximizes exhaust flow, while maintaining a pleasing exhaust note that's neither too loud nor too quiet. The mufflers are also wrapped in a high-temperature ceramic fiber insulation, which not only reduces under-seat heat but also provides a sleek, finished look.

The Jekill & Hyde 66737-10 Softail Exhaust Header Muffler Kit comes with all necessary bolts and clamps for an easy installation. The kit is designed to fit most Harley-Davidson Softail models from 2012 onwards, including the Breakout, Street Bob, Softail Slim, and Softail Deluxe. However, it's always recommended to consult the fitment chart provided by the manufacturer before making a purchase to ensure compatibility with your specific model.

In summary, the Jekill & Hyde 66737-10 Harley-Davidson Softail Exhaust Header Muffler Kit is an excellent choice for Harley-Davidson Softail owners looking to boost their bike's performance and add a unique, customized look. With its high-quality stainless steel construction, optimal exhaust flow design, and easy installation process, this exhaust system is sure to exceed your expectations and provide you with a riding experience that's both powerful and enjoyable.

Jekill Mr. Hyde 66737-10 Harley Softail Exhaust Header Muffler Kit 4189: A Detailed Analysis

Introduction:

The Jekill Mr. Hyde 4189 exhaust header muffler kit for Harley Softail motorcycles is a popular aftermarket upgrade known for its unique design and performance enhancement. In this analysis, we will discuss the pros and cons of investing in this exhaust system to help you make an informed decision.

Pros:

1. Performance enhancement: The Jekill Mr. Hyde exhaust system is designed to improve the overall performance of your Harley Softail motorcycle. It increases the engine's power output, resulting in better acceleration and a more responsive ride.

2. Unique design: The exhaust system's distinctive appearance is a significant selling point for many riders. The blacked-out finish and the Jekill Mr. Hyde logo add a menacing look to your bike.

3. Sound: The exhaust system produces a deep, throaty exhaust note that is sure to turn heads. This sound is a result of the high-performance mufflers and the free-flowing headers, which allow more exhaust gases to exit the engine.

4. Durability: The Jekill Mr. Hyde exhaust system is made from high-quality stainless steel, making it resistant to rust and corrosion. This ensures that the exhaust system lasts longer than OEM parts.

5. Fit and finish: The exhaust system comes with precise fitment and excellent finish quality. This makes for an easy installation process and a visually appealing final product.

Cons:

1. Cost: The Jekill Mr. Hyde exhaust system is more expensive than OEM parts. This may deter some riders from making the purchase, especially those on a tight budget.

2. Loudness: The exhaust system is quite loud, which may not be suitable for all riding environments. Riders who prefer a quieter ride may find this to be a significant drawback.

3. Maintenance: The exhaust system requires regular maintenance, such as oil changes and spark plug replacements, to ensure optimal performance. This can add to the overall cost of ownership.

4. Installation: Installing the exhaust system can be a complex process, especially for those without mechanical experience. Professional installation is recommended to ensure proper fitment and functionality.

Conclusion:

The Jekill Mr. Hyde 66737-10 Harley Softail Exhaust Header Muffler Kit 4189 offers several advantages, such as improved performance, unique design, and a deep exhaust note. However, it also comes with some drawbacks, such as cost, loudness, and maintenance requirements.

If you are a rider who values performance and aesthetics and is not deterred by the additional cost and maintenance requirements, then this exhaust system could be an excellent investment for you. However, if you prefer a quieter ride or have a limited budget, it may be worth considering alternative exhaust options.

Recommendation:

For those who are looking for a high-performance exhaust system with a unique design and don't mind the added cost and maintenance requirements, the Jekill Mr. Hyde 66737-10 Harley Softail Exhaust Header Muffler Kit 4189 is an excellent choice. However, it is essential to ensure that the installation is performed by a professional to ensure proper fitment and functionality.

Details:

2012 Harley Softail JEKILL HYDE ELECTRONIC Exhaust Header Muffler Kit #4189, Fallen Cycles Stock #4189 The Pipes have scrapes and dents, as shown in the photos. Model: Softail CVO Convertible FLSTSE3.

specifications exhausterupt:

  • for models: Softail
  • for makes: Harley
  • for years: 2012
  • brand: Dr. Jekill Mr Hyde
  • manufacturer part number: 66737-10
  • type: Exhaust Headers
  • country of origin: United States

shipping exhausterupt:

  • service: Standard
  • class: Standard
  • cost: $30.00
  • type: Fixed
  • transit: 4-7 Days

general exhausterupt:

  • condition: Used
  • Motorcycle Scooter Parts Accessories > Exhaust Emission Systems > Exhaust System Kits

offer exhausterupt:

  • started: March 14, 2026
  • sold: 0
  • availability: In Stock
  • quantity: 1
  • options: Ship-to-home

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seller exhausterupt:

  • city: Daytona Beach, Florida
  • # reviews: 49060
  • rating: 99.6%

returns exhausterupt:

  • policy: Returns Accepted
  • time: 30 Days
  • paid by: Buyer
for models: softail, for makes: harley, for years: 2012, type: exhaust headers, country of origin: united states,
category: motorcycle parts > motorcycle scooter parts accessories > exhaust emission systems > exhaust system kits, sku: 6922096661680711,

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