S-S CYCLE MN-B2B5 Breather Conversion Fxstc Am Kit Reviews MN/B2B5S

( Brand: S-s Cycle ), ( Manufacturer Part Number: MN/B2B5 ), ( Compatible Year: 1999 1998 1997 1996 1995 1994 1993 ), ( Compatible Make: Harley Davidson ), ( Compatible Model: Fxstc Softail Custom ), ( Bundle Description: 1 Pc Genuines S Cycle Breather Conversion Kit ), ( Type: Breather Conversion Kit ), ( Core Charge: Free No Core Charge ), ( Fitment Type: Direct Replacement )

Review S CYCLE Scycle Mn/b2b5sbreather Conversion Kit Harley Davidson Fxstc Am fits 1993–1999

The **Cycle MN/B2B5 Breather Conversion Kit** is a meticulously engineered upgrade designed to transform the breathing dynamics of your **1993 1999 Harley-Davidson FXSTC AM (MN/B2B5)** engine, unlocking untapped performance while preserving the integrity of your stock airbox and intake system. This kit is specifically tailored for the **Big Twin (MN) and B2B5 (Big Twin Evolution)** configurations, offering a seamless transition from the restrictive factory breather setup to a high-flow, high-efficiency alternative that enhances throttle response, smooths out power delivery, and reduces backpressure critical for engines that rely on proper scavenging to maintain peak performance. Unlike generic aftermarket solutions, this kit is built with precision, featuring a **high-quality, corrosion-resistant aluminum breather housing** that integrates effortlessly with the stock airbox, eliminating the need for costly modifications or custom fabrication. The included **performance-grade breather assembly** incorporates a **large-diameter, low-restriction intake valve** that allows for optimal airflow while minimizing turbulence, ensuring that your engine breathes cleaner and more efficiently. This upgrade is particularly beneficial for riders who push their Big Twin to its limits, whether for daily cruising, track days, or high-RPM spirited riding, as it helps mitigate the effects of heat soak and improves cylinder scavenging, leading to better combustion and reduced carbon buildup. The kit also includes **OEM-compatible gaskets and mounting hardware**, ensuring a secure, leak-free installation that maintains factory alignment without compromising structural integrity. Whether you're aiming for subtle gains in mid-range torque or a more aggressive powerband extension, this breather conversion kit delivers a straightforward, cost-effective solution that enhances your Harley s breathing capabilities without the need for extensive modifications. Perfect for both enthusiasts looking to refine their engine s efficiency and mechanics seeking a reliable upgrade for their shop builds, the **Cycle MN/B2B5 Breather Conversion Kit** stands as a proven choice for those who demand performance without sacrificing reliability.

### Pros and Cons of buying a Cycle MN/B2B5 Breather Conversion Kit for a 1993 1999 Harley-Davidson FXSTC AM (MN/B2B5)

#### **Pros**

1. **Improved Engine Breathing and Performance**

The primary purpose of a breather conversion kit is to replace the restrictive stock air box with a more efficient system, allowing better airflow into the engine. This can lead to improved throttle response, especially noticeable in low-to-mid RPM ranges, and a slight increase in horsepower and torque. For an FXSTC, which is already a high-performance bike, this modification can enhance its already strong performance characteristics.

2. **Reduced Backpressure**

The stock air box on the MN/B2B5 engines is known to create backpressure, which can restrict airflow and reduce efficiency. The Cycle kit replaces this with a more open design, reducing restrictions and allowing the engine to breathe more freely.

3. **Easier Installation**

Compared to some aftermarket breather kits, the Cycle MN/B2B5 breather conversion kit is designed specifically for these engines and is relatively straightforward to install. It comes with all necessary components, including the breather housing, intake tube, and mounting hardware, reducing the need for additional modifications or custom fabrication.

4. **Compatibility with Stock Components**

The kit is designed to work seamlessly with the stock intake system, meaning you won t need to modify or replace other parts of the engine or exhaust system. This makes it a more "plug-and-play" solution compared to some other performance modifications that require additional changes.

5. **Cost-Effective Performance Boost**

Compared to more extensive modifications like porting the head, swapping in a different camshaft, or upgrading the exhaust, a breather conversion is relatively inexpensive. It offers a noticeable performance improvement without the higher cost of more invasive mods.

6. **Maintains Stock Reliability**

Since the kit doesn t alter the engine s internals or require significant changes to the stock setup, it helps preserve the reliability and longevity of the engine. This is particularly important for older Harley-Davidson engines, which are known for their durability but can be sensitive to aggressive modifications.

7. **Aesthetic and Functional Upgrade**

The new breather housing often looks cleaner and more modern than the stock unit. While this is subjective, many riders appreciate the improved appearance of the intake area, which can contribute to an overall more polished look for the bike.

---

#### **Cons**

1. **Mixed Results on Horsepower Gains**

While the breather conversion can improve throttle response and airflow, the actual horsepower gains are often modest typically in the range of 5 10 horsepower, depending on the engine s condition and other factors. For riders who are primarily concerned with raw power, this may not be a significant upgrade compared to more substantial modifications like a camshaft swap or exhaust system upgrade.

2. **Potential for Increased Oil Consumption**

Some riders report that a breather conversion can lead to slightly higher oil consumption, particularly if the engine is already running on the edge of its limits. This is because the improved airflow can contribute to slightly higher combustion temperatures, which may accelerate oil breakdown. However, this is not a universal issue and depends on the engine s condition and maintenance history.

3. **Limited Impact on Top-End Power**

The breather conversion primarily benefits low-to-mid RPM performance. At higher RPMs, the gains are often negligible unless combined with other mods like a different camshaft or exhaust system. If your primary focus is top-end power, this kit alone may not deliver the results you re looking for.

4. **Requires Attention to Detail During Installation**

While the kit is designed for ease of installation, improper fitting or sealing can lead to leaks or reduced performance. For example, if the breather housing isn t securely mounted or if the intake tube isn t properly connected, airflow restrictions could negate the benefits of the kit. This requires careful attention during installation.

5. **May Not Be Noticeable on a Well-Tuned Bike**

If your FXSTC is already running with aftermarket components like a performance camshaft, exhaust system, or intake manifold, the additional benefits of a breather conversion may be minimal. In such cases, the kit may not provide a significant upgrade beyond what you re already achieving.

6. **Potential for Increased Noise**

The new breather housing can make the engine sound slightly more aggressive, particularly at lower RPMs. While this is a minor trade-off for many riders, those who prefer a quieter or more traditional Harley sound may find the change noticeable.

7. **Not a Cure for Engine Issues**

If your FXSTC has underlying engine problems such as carbon buildup, worn valves, or poor compression the breather conversion alone won t fix these issues. It s important to address these problems first to ensure that the kit provides the intended benefits without exacerbating existing issues.

---

### **Conclusion**

The Cycle MN/B2B5 breather conversion kit is a worthwhile modification for riders looking to enhance the breathing and low-to-mid RPM performance of their 1993 1999 Harley-Davidson FXSTC AM. It offers a straightforward, cost-effective way to improve throttle response and airflow without requiring extensive changes to the engine or exhaust system. The installation is relatively simple, and the kit is designed to work seamlessly with stock components, making it a low-risk upgrade.

However, the performance gains are modest, and the kit may not be as impactful for riders focused on top-end power or those who have already invested in more aggressive modifications. Additionally, there is a slight risk of increased oil consumption or minor noise changes, though these are generally minor issues for most riders.

For the average rider who wants a subtle but noticeable performance boost without significant cost or complexity, the Cycle breather conversion kit is a solid choice. It s particularly well-suited for those who enjoy the stock or lightly modified FXSTC and want to squeeze out a little more power and responsiveness from their engine.

---

### **Recommendation**

- You want a simple, cost-effective way to improve low-to-mid RPM performance.

- Your bike is otherwise in good condition and doesn t have underlying engine issues.

- You appreciate the improved throttle response and slightly more aggressive sound.

- You re not looking for dramatic power gains but want a noticeable upgrade beyond stock.

- You re primarily interested in top-end power and have already invested in other mods like a camshaft or exhaust system.

- Your engine has known issues (e.g., carbon buildup, worn valves) that need to be addressed first.

- You prefer to keep the stock sound and appearance of your FXSTC.

- You re on a tight budget and want to prioritize more impactful modifications.

The Cycle breather conversion kit is a **recommended upgrade** for most FXSTC riders, especially those who want a modest but effective performance boost with minimal hassle. It s a small but meaningful step toward enhancing the bike s already strong character. Pair it with proper maintenance, and it should provide reliable and noticeable benefits for years to come.

Details:

Cycle Breather Conversion Kit for 1993 - 1999 Harley Davidson FXSTC am: Status: In Stock.

part #: mnb2b5 price

• $65.53

specifications intakefuelmotorcycle:

• for makes: Harley, Davidson
• for years: 1993-1999
• brand: S-s Cycle
• mpn: Mn/b2b5
• compatible year: 1999 1998 1997 1996 1995 1994 1993
• compatible make: Harley Davidson
• compatible model: Fxstc Softail Custom
• bundle description: 1 Pc Genuines S Cycle Breather Conversion Kit
• type: Breather Conversion Kit
• core charge: Free No Core Charge
• fitment type: Direct Replacement

offer intakefuelmotorcycle:

• started: May 27, 2026
• availability: In Stock
• options: Ship-to-home
• quantity: 1
• sold: 0

seller intakefuelmotorcycle:

• city: Multiple warehouses
• # reviews: 23367
• rating: 99.3%

general intakefuelmotorcycle:

• condition: New
• Motorcycle Scooter Parts Accessories > Air Intake Fuel Delivery > Other Air Intake Fuel Delivery

shipping intakefuelmotorcycle:

• class: Standard
• service: Standard
• transit: 2-6 Days
• cost: $0.00
• type: Fixed

payments intakefuelmotorcycle:

• credit card: Diners-club
• wallet: Google-pay
• other

returns intakefuelmotorcycle:

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

S-s Cycle MN-B2B5 Is Similar To:

• Tuned 106-2448 Kit Chrome Induction Cycle (9.4% similar) Anything installed, mounted, used or in otherwise not 100 new condition will not be honored for a return. Even if for a few seconds. This includes mounting windshields, exhaust, etc. Please with any questions. The item must be 100 new in its original condition. Manufacturer's note not legal for ...(November 16th, 2014)
• Kit Adapter 106-4978 Chrome Bracket Intake Tuned Used Cycle Bore Single (18.1% similar) This kit is being sold as used since it was part of a display and does have some minor marks. Combined shipping is available upon request. 99 '07 carburetors big twins and '01 '07 Delphi efi big twins. Net and we'll be happy to help. If you cannot find what your looking for please at hashed. ...(November 11th, 2014)
• 16-1223 Cycle Intake Manifold For Shovelheads Type (34.3% similar) And 2/1 4IN. Bore sizes if you cannot find answers to your questions here, please. Manifold flange bolt pattern will accepts es, ls, super a, b and e carbs as well stock butterfly tilts, Bendix, Khan carburetors manifolds are available for o-ring rubber band cylinder heads fits carburetors with 1/7 ...(October 7th, 2018)
• 16-1302 Cycle Band Style Manifold For Super Or (35.4% similar) Bull for use with 96 sidewinder kit cylinders...(October 24th, 2018)
• 16-2588 Ss Cycle Manifold For (31.9% similar) Before purchasing, please with any questions regarding the product specifically for your year make model. It is not a picture of the exact item for sale. Already purchased an item and need to return it. Shipping most all of our listings include free to the USA. We totalizators in some instances. ...(May 16th, 2017)
• Height Stock Manifold 16-5059 1.940 410 Set Harley-davidson Vfi Cycle Used (31.9% similar) Net and we'll be happy to help. 410, harley Davidson's Cycle VF manifold set stock height . Some items are available for order only due to long lead times from the manufacturer or vendor. A special tool is used to measure this distance. It is in the natural finish and is made to be used withes ...(October 6th, 2014)
• 17-0101 Teardrop Air Cleaner Kit Cv Bt Cycle (9.4% similar) ...(May 25th, 2018)
• 17-0314 Harley Air Cleaner Shim Kit Backplate Cycle (19.3% similar) No shipping outside the lower 48 states exception. Location bin 4A...(May 17th, 2018)
• 17-0347 And Cycle Breather Screw (29.3% similar) Expedited shipping via USPS priority mail with delivery confirmation is available. This occasionally happens, and is rare...(July 19th, 2018)
• 17-0348 S Cycle Screw Breather (31.6% similar) 250 rear head harley-davidson v-twin chopper motorcycles om: 1 sold as pictured.s Cycle screw, breather. PARTS1-844-MYV-TWINVITAL-VTWIN-CYCLES...(December 22nd, 2017)
• 17-0355 S Cycle Breather Fitting (34.5% similar) This excludes errors deemed to be the mistake of Murray Cycles. 95S carburetor replacement part photos are for reference and may be slightly different every application. These are the main fees associated with an online retail marketplace, and neither recoup able if you decide no longer want product...(January 3rd, 2018)