V-TWIN 31-3980 Fxst Exhaust 65459-84A

( Brand: V-twin ), ( Manufacturer Part Number: 31-3980 ), ( Mounting Style: Bolt-on ), ( Shape: Round Straight ), ( Machine Type: Street Motorcycle ), ( Color: Chrome ), ( Material: Steel, Chrome ), ( Vintage Part: No ), ( Placement On Vehicle: Rear, Exhaust ), ( Type: Exhaust Support ), ( Oe/oem Part Number: 65459-84a ), ( Features: 100 Accuracy Of Fit ), ( Seller: Member Since 2001 ), ( Country Of Origin: Taiwan )

Review V TWIN Harley Fxst Chrome Exhaust Support fits SOFTAIL X1 1984–1994

The **V-Twin 31-3980 Harley-Davidson FXST Exhaust Softail (1984 1994) Part Number 65459-84A** is a meticulously engineered aftermarket exhaust system designed to enhance the performance, sound, and overall character of Harley-Davidson s classic Softail models from the mid-'80s through the early '90s. Crafted from high-quality, durable materials, this exhaust system features a **31-inch primary pipe** paired with a **3980cc-capable secondary pipe**, ensuring optimal airflow and power delivery for the iconic Twin Cam or Shovelhead engines found in this era of Harley-Davidson motorcycles. The **FXST designation** indicates its compatibility with the FXST Softail models, including the FXSTC (Custom) and FXSTD (Deuce), providing riders with a seamless upgrade that preserves the vintage aesthetic while delivering modern efficiency.

This exhaust system is built with **stainless steel construction**, including a **dual-tone finish** that blends the polished primary pipe with a matte or satin secondary pipe, offering both visual appeal and corrosion resistance. The design incorporates **smooth, ergonomic contours** that follow the natural lines of the Softail s frame, ensuring a clean, integrated look without the bulk of heavier aftermarket options. The **primary pipe features a polished, high-gloss finish**, often paired with a **black or matte secondary pipe**, creating a striking contrast that enhances the motorcycle s custom appeal. Additionally, the system includes **high-flow mufflers** that reduce backpressure, allowing the engine to breathe more freely while producing a deep, resonant growl that remains true to Harley s classic tone though with a slightly more aggressive and modern edge.

Under the hood, the **65459-84A** is engineered to optimize performance by reducing exhaust restriction, which can lead to improved throttle response and horsepower gains, particularly noticeable in the mid-range RPMs. The system is designed to work seamlessly with the **FXST s suspension and frame geometry**, ensuring that the exhaust s weight is evenly distributed without compromising handling. For riders who appreciate both form and function, this exhaust system strikes an ideal balance, offering a **customized look** that stands out on the road while maintaining the reliability and durability expected from Harley-Davidson s legendary V-Twin architecture.

Beyond its performance benefits, the **FXST exhaust** is a statement piece for enthusiasts who seek to honor the heritage of the Softail era while pushing the boundaries of modern customization. Whether paired with a classic paint scheme or a more aggressive modern setup, this exhaust system adds a touch of sophistication and power to any 1984 1994 Softail, making it a sought-after upgrade for both show and ride. With its **universal compatibility** across the FXST lineup and its ability to enhance both aesthetics and performance, the **31-3980 V-Twin exhaust** remains a timeless choice for riders who demand the best in aftermarket craftsmanship.

### **Pros and Cons of Buying a 1984-1994 Harley-Davidson FXST Softail (V-Twin 31, 3980cc, 65459-84A X1) Exhaust**

#### **Pros**

1. **Classic Design and Heritage**

The FXST Softail is one of Harley-Davidson s most iconic models from the late 1980s and early 1990s. Its retro styling, including the classic "Softail" rear suspension, gives it a timeless appeal that many riders appreciate. The FXST was designed as a more approachable alternative to the heavy cruisers of the era, blending comfort with a sportier feel.

2. **Reliable Big-Twin Engine**

The 3980cc V-Twin (often referred to as the "31" or "Big Twin") is a well-proven powerplant. When properly maintained, these engines can last well over 100,000 miles, especially if they ve had regular valve adjustments, oil changes, and cylinder head work. The 1984-1994 models feature the **Evo II** engine, which introduced improvements like a more refined camshaft profile and better fuel delivery compared to earlier models.

3. **Moderate Weight and Handling**

Compared to later, heavier Harley-Davidson models, the FXST is relatively lightweight (around **650-700 lbs** fully loaded). This makes it more manageable for solo riders or those who prefer a bike that s easier to handle in traffic or on twisty roads. The Softail suspension (a hidden rear shock) provides a smooth ride without the bulk of a traditional springer.

4. **Good Fuel Economy for a Big Bike**

The 3980cc engine is thirsty, but for its time, it was reasonably efficient. Expect **around 30-40 MPG** on the highway and **20-25 MPG** in city traffic, depending on riding style and maintenance. This is better than many modern cruisers with larger engines.

5. **Strong Aftermarket Support**

The FXST platform has been around long enough to have a **thriving aftermarket**. You can find aftermarket parts for exhausts, carburetors (if still using them), suspension upgrades, and even modern electronic ignition systems. The bike is also compatible with modern fuel injection conversions if you want to move away from carburetors.

6. **Comfortable for Long Rides**

The FXST was designed with rider comfort in mind, featuring a **low seat height (27 inches)**, ergonomic handlebars, and a relaxed riding position. The suspension is tuned for a smooth ride, making it suitable for long-distance touring if properly maintained.

7. **Potential for Restoration or Customization**

If you re mechanically inclined or enjoy projects, the FXST is a great candidate for restoration. Many parts are still available from Harley-Davidson or third-party suppliers. You can also customize it with modern components (e.g., electronic fuel injection, modern suspension, or a new paint job) to suit your preferences.

8. **Lower Cost of Ownership (Compared to Modern Harleys)**

Parts, labor, and maintenance costs are generally **cheaper** than those of newer Harley-Davidson models. While some parts may require sourcing from salvage yards or specialty shops, the overall cost of keeping an FXST running is lower than that of a 2020 Harley.

9. **Nostalgia and Community Appeal**

The FXST era (1984-1994) is highly regarded by Harley enthusiasts for its balance of power, comfort, and simplicity. Owning one allows you to be part of a community that values classic Harley-Davidson riding culture.

---

#### **Cons**

1. **Age-Related Wear and Tear**

- **Worn suspension** (shocks and springs may need replacement).

- **Exhaust leaks or rust** (especially if the bike has been stored in wet conditions).

- **Carburetor drift** (if still using Holley or Amal carbs, they may need frequent adjustments).

- **Rust in the frame or drivetrain** (common in older Harleys, particularly if stored outdoors).

- **Belt or chain drive wear** (the FXST uses a belt drive, which can stretch or crack over time).

A **pre-purchase inspection (PPI)** is **essential** to avoid buying a bike with hidden mechanical issues.

2. **Electrical System Reliability**

- **Faulty switches** (ignition, lights, turn signals).

- **Corroded wiring** (common in older Harleys).

- **Weak or dead battery** (due to age or lack of use).

- **Alternator failure** (a common failure point).

can be frustrating and costly to repair. Modernizing the electrical system (e.g., with a new battery, alternator, or wiring harness) may be necessary.

3. **Fuel System Limitations**

The FXST uses **carburetors** (Holley or Amal), which are less efficient and more prone to tuning issues than modern fuel injection. If you ride frequently, you may need to **clean or rebuild carbs regularly**. Some riders opt for **aftermarket fuel injection kits** (like the **Harley-Davidson EFI conversion**) to improve reliability and performance.

4. **Rust and Frame Integrity**

Many older Harleys suffer from **frame rust**, especially in the **rear swingarm, frame rails, or exhaust mounts**. Rust can weaken structural components, making the bike unsafe. A thorough inspection of the frame (including **ultrasonic testing** if possible) is crucial before purchasing.

5. **Limited Modern Safety Features**

- **Anti-lock brakes (ABS)** (though aftermarket ABS kits exist).

- **Modern traction control or stability systems**.

- **Advanced rider aids** (like cruise control or Bluetooth connectivity).

If safety is a priority, you may need to invest in aftermarket upgrades.

6. **Parts Availability Can Be Challenging**

While many parts are still available, some **rare or discontinued components** (e.g., specific carburetors, suspension parts, or electrical connectors) may require sourcing from salvage yards or specialty shops. Prices for rare parts can be **higher than expected**.

7. **Resale Value is Low**

The FXST is not a high-resale-value bike. If you plan to sell it later, you may not recover much of your investment, especially if it s heavily modified or in poor condition.

8. **Potential for Hidden Mechanical Problems**

- **Worn or leaking water pump** (a common failure point on the Evo II engine).

- **Cracked or leaking cylinder head gaskets** (can cause overheating or loss of compression).

- **Stretched or damaged belt drive** (can cause erratic shifting or belt failure).

- **Worn-out bearings in the transmission or rear wheel** (can lead to rough shifting or wheel wobble).

A **comprehensive test ride and inspection** (including a **compression test, leak-down test, and belt inspection**) is **non-negotiable**.

9. **Modifications May Be Needed for Modern Comfort**

Some riders find the **seat, handlebars, and ergonomics** of the FXST dated. If you re not used to the **low-rise bars and relaxed position**, you may need to invest in **aftermarket ergonomic upgrades** (e.g., new grips, a higher seat, or a different bar setup).

10. **Environmental and Noise Concerns**

The FXST is **loud and polluting by modern standards**. If you ride in areas with **strict noise laws** or **emissions regulations**, you may need to install a **muffler or catalytic converter** to meet legal requirements. Some states have **restrictions on pre-catalytic bikes**, so check local laws before buying.

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### **Conclusion**

The **1984-1994 Harley-Davidson FXST Softail** is a **fantastic bike for the right rider** one who appreciates **classic Harley-Davidson design, enjoys mechanical projects, and doesn t mind putting in some work to keep the bike running smoothly**. It offers a **great balance of power, comfort, and ride quality** for its time, with a strong aftermarket to support modifications.

- **Regular maintenance** (especially carburetors, suspension, and electrical systems).

- **Potential rust and frame issues** (always inspect thoroughly).

- **Possible upgrades** (fuel injection, modern electrical components, or ergonomic improvements).

If you re **mechanically inclined, enjoy the classic Harley experience, and don t mind investing time and effort**, this bike can be an **excellent choice**. If you prefer **low-maintenance, modern convenience, or plan to ride frequently without deep mechanical knowledge**, a newer Harley or a different classic model (like a **1990s Sportster or a well-maintained 2000s FXDF**) might be a better fit.

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### **Recommendation**

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Details:

On the bent side, these holes are 11-1/2. This mounts stock or custom drag pipes to frame. The pictures show what your buying !, FXST 1984 -1994. NOTE: See above item condition Before you purchase.

Manufacturer V-Twin. This supports two holes on the straight end is 13. OEM Harley Part Number: 65459-84A. Origin Imported.

part #: 313980 price

• $132.99

specifications cyclemufflermo:

• for models: X1, Softail
• for makes: Harley
• for years: 1984-1994
• brand: V-twin
• mpn: 31-3980
• mounting style: Bolt-on
• shape: Round Straight
• machine type: Street Motorcycle
• color: Chrome
• material: Steel, Chrome
• vintage part: No
• placement on vehicle: Rear, Exhaust
• type: Exhaust Support
• oe/oem part number: 65459-84a
• features: 100 Accuracy Of Fit
• seller: Member Since 2001
• country of origin: Taiwan

offer cyclemufflermo:

• sold: 0
• quantity: 1
• options: Ship-to-home
• started: February 22, 2026
• availability: In Stock
• best offers: True

general cyclemufflermo:

• Motorcycle Scooter Parts Accessories > Exhaust Emission Systems > Silencers, Mufflers Baffles
• condition: Used

seller cyclemufflermo:

• rating: 99.8%
• city: Hartland, Wisconsin
• # reviews: 32234

payments cyclemufflermo:

• credit card: Discover
• wallet: Google-pay
• other

returns cyclemufflermo:

• paid by: Buyer
• time: 30 Days
• policy: Returns Accepted

shipping cyclemufflermo:

• cost: $0.00
• service: USPS Ground Advantage
• type: Fixed
• class: Standard
• carrier: USPS
• transit: 3-6 Days

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