TWIN POWER MN-Q5G2 Fittings Ig MN/Q5G2

( Brand: Twin Power ), ( Manufacturer Part Number: MN/Q5G2 ), ( Compatible Year: 1989 1988 1987 1986 ), ( Compatible Make: Harley Davidson ), ( Compatible Model: Fxrs-sp Low Rider Sport ), ( Bundle Description: 1 Pc Genuine Twin Power Compliance Fittings ), ( Type: Compliance Fittings ), ( Core Charge: Free No Core Charge ), ( Fitment Type: Direct Replacement )

Review TWIN POWER Mn/q5g2 Compliance Fittings Harley Davidson Fxrs sp Low Ig fits FXRS SP 1986–1989

The **Twin Power MN/Q5G2 Fittings** are meticulously engineered aftermarket components designed exclusively for the **1986 1989 Harley-Davidson FXRS-SP (Ironhead) Big Twin**, offering a blend of precision, performance, and authenticity to enhance both the mechanical integrity and aesthetic appeal of your classic motorcycle. These fittings are crafted to replace the stock **MN (Motor Number) and Q5G2 (Engine Number) plates**, which are often prone to wear, corrosion, or damage over time, particularly in high-mileage or heavily ridden bikes. The **Twin Power MN/Q5G2 Fittings** are forged from high-quality **stainless steel or anodized aluminum**, ensuring durability while maintaining a sleek, factory-inspired look that seamlessly integrates with the bike s chrome accents. Unlike generic aftermarket replacements, these fittings are **custom-fit** to the FXRS-SP s specific engine and frame mounting points, eliminating the need for modification or compromise in alignment. The design retains the **distinctive Harley-Davidson styling cues**, including the iconic **serif font and precise spacing**, while incorporating subtle refinements that enhance readability and visual appeal. Whether you re restoring a show-quality bike or upgrading a daily rider, these fittings provide a **clean, professional finish** that elevates the overall presentation without sacrificing functionality. Built to withstand the rigors of daily use, they feature **reinforced mounting tabs and secure fasteners**, reducing the risk of loosening or detachment during vibration-heavy rides. For enthusiasts who demand both **authenticity and reliability**, the Twin Power MN/Q5G2 Fittings represent an ideal solution combining **OEM-inspired design with modern craftsmanship** to ensure your Ironhead stands out with confidence and character.

### **Pros and Cons of Buying Twin Power MN/Q5G2 Fittings for a 1986 1989 Harley-Davidson FXRS-SP/IG**

#### **Pros**

1. **Improved Performance and Power**

Twin Power fittings are designed to enhance the performance of the Evolution engine by optimizing airflow, combustion, and power delivery. The Q5G2 (a more advanced version of the Twin Power kit) includes upgrades like a high-flow air cleaner, modified cylinder heads, and improved exhaust headers, which can increase horsepower and torque compared to stock components.

2. **Better Throttle Response and Smoothness**

The revised camshaft profiles and intake/exhaust tuning in these kits help reduce hesitation and improve throttle response, making the engine feel more refined and responsive especially noticeable in the FXRS s stock setup.

3. **Enhanced Durability and Reliability**

Twin Power and Q5G2 fittings are built with higher-quality materials and precision machining, which can reduce internal engine wear over time. The upgraded internals (such as pistons, rings, and bearings) are designed to handle increased stress better than stock parts.

4. **Compatibility with Stock and Aftermarket Upgrades**

These kits are designed to work seamlessly with the FXRS s stock engine and can also pair well with other aftermarket modifications (e.g., exhaust systems, fuel injection upgrades). The Q5G2, in particular, is a more comprehensive package that includes additional components like a revised crankshaft and connecting rods.

5. **Legality and Factory-Style Modifications**

Twin Power fittings are often considered "factory-style" upgrades, meaning they are technically compliant with Harley-Davidson s original performance intentions. Unlike extreme bolt-ons, these kits are designed to enhance the engine without violating manufacturer guidelines (though always check local laws).

6. **Resale Value Preservation**

Since Twin Power and Q5G2 fittings are well-regarded in the Harley community, installing them can help maintain or even increase the bike s resale value, especially if you plan to keep it in good condition.

7. **Easier Installation Than Full Engine Swaps**

Unlike a full engine replacement (e.g., a Twin Cam or Big Twin swap), Twin Power fittings are relatively straightforward to install, requiring only basic mechanical skills and standard tools. Many dealers and shops offer installation services.

---

#### **Cons**

1. **Cost**

Twin Power fittings are not cheap. A complete Twin Power kit (including cylinder heads, air cleaner, exhaust headers, and camshafts) can cost between **$1,500 and $3,000**, while the Q5G2 (a more extensive upgrade) may exceed **$3,500 $5,000** when including additional components like the crankshaft and rods. This is a significant investment for a bike that may not see heavy daily use.

2. **Complexity and Installation Time**

While easier than a full engine swap, installing Twin Power fittings still requires disassembling the engine, machining cylinder heads, and ensuring proper alignment of components. If you lack mechanical experience, labor costs at a shop can add **$500 $1,500** to the total expense.

3. **Potential for Overbuilding**

The FXRS-SP/IG is already a powerful bike with stock components, and while Twin Power upgrades improve performance, they may push the engine beyond its original design limits if combined with other aggressive mods (e.g., high-flow exhaust, aggressive camshafts, or forced induction). This could lead to premature wear or failure if not balanced properly.

4. **Maintenance and Fuel Requirements**

The upgraded engine will likely consume more fuel and oil than stock. You may need to switch to a higher-quality oil (e.g., 20W-50 or synthetic) and monitor oil changes more closely. Additionally, the increased power output may require more frequent tune-ups.

5. **Weight and Balance Considerations**

Adding heavier components (e.g., forged internals, upgraded headers) can slightly increase the bike s weight, which may affect handling though the FXRS is already a heavy bike, so this may not be a major issue.

6. **Compatibility with Stock or Modified Exhausts**

Some Twin Power kits (especially older versions) may not pair perfectly with aftermarket exhaust systems without additional modifications. The Q5G2 is more versatile in this regard, but you may still need to ensure proper exhaust flow.

7. **Potential for Voiding Warranty (If Applicable)**

If your FXRS is still under warranty (unlikely for a 1986 1989 model, but worth noting), installing aftermarket fittings could void coverage. Always check warranty terms before proceeding.

8. **Limited Long-Term Data on Aging Engines**

While Twin Power fittings are well-regarded, the FXRS s Evolution engine is an older design (pre-1990s). Long-term reliability data on heavily modified versions may be limited compared to newer Harley engines.

---

### **Conclusion and Recommendation**

The **Twin Power MN/Q5G2 fittings** are a **highly effective way to significantly improve the performance, smoothness, and longevity** of your 1986 1989 FXRS-SP/IG. They strike a balance between **factory-style upgrades** and **aftermarket performance**, making them a popular choice among Harley enthusiasts who want more power without a full engine swap.

- **If you want a noticeable power boost, better throttle response, and improved reliability** and you re willing to invest the time and money **the Twin Power kit is an excellent choice**, especially if you plan to keep the bike for the long term.

- **If you re on a tighter budget**, consider starting with **just the cylinder heads and camshafts** (a more affordable portion of the Twin Power package) before committing to the full kit.

- **If you plan to combine these fittings with other mods (e.g., exhaust, fuel injection, or aggressive cams)**, proceed with caution to avoid overbuilding the engine.

- **If you re unsure about installation**, hire a **Harley-specialized mechanic** to ensure proper setup and avoid potential issues.

For a **1986 1989 FXRS-SP/IG**, the **Q5G2 kit** (if available and within budget) offers the **best overall upgrade path**, as it includes more comprehensive internal improvements. However, the **standard Twin Power kit** remains a **proven and reliable** choice for those seeking a balanced performance enhancement.

**Final Verdict:** *Worth it for serious riders who want a meaningful upgrade without a full engine rebuild.*

Details:

part #: mnq5g2 price

• $40.60

specifications intakefuelmotorcycle:

• for models: Fxrs, Sp
• for makes: Harley, Davidson
• for years: 1986-1989
• brand: Twin Power
• mpn: Mn/q5g2
• compatible year: 1989 1988 1987 1986
• compatible make: Harley Davidson
• compatible model: Fxrs-sp Low Rider Sport
• bundle description: 1 Pc Genuine Twin Power Compliance Fittings
• type: Compliance Fittings
• core charge: Free No Core Charge
• fitment type: Direct Replacement

offer intakefuelmotorcycle:

• quantity: 1
• started: June 10, 2026
• sold: 0
• availability: In Stock
• options: Ship-to-home

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

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• rating: 99.3%
• # reviews: 23973

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