YAMAHA 04-54666 Brothers Exhaust Pipe Header Muffler Slip Silencer

( Brand: Yamaha ), ( Manufacturer Part Number: 04-54666 ), ( Mounting Style: Slip-on ), ( Shape: Oval Straight ), ( Machine Type: Street Motorcycle ), ( Material: Stainless Steel ), ( Muffler Type: Combination ), ( Vintage Part: No ), ( Placement On Vehicle: Exhaust ), ( Type: Muffler ), ( Manufacturer Warranty: 1 Year ), ( Features: Easy To Replace ), ( Finish: Polished )

Review YAMAHA Two Brothers Exhaust Pipe Header Muffler Slip On Can Silencer fits FZ6 2007–2009

The **Yamaha 04-54666 (07-09 FZ6 Brothers Exhaust Pipe Header Muffler Slip Silencer)** is a meticulously engineered aftermarket component designed to enhance both the performance and aesthetic appeal of the iconic Yamaha FZ6 brothers, covering models from the 2007 to 2009 production years. Crafted with precision and built to exacting standards, this exhaust system replaces the stock header, muffler, and slip-on silencer, delivering a seamless integration that maximizes airflow while reducing backpressure. The header is constructed from high-quality stainless steel, ensuring durability and resistance to corrosion, even under the most demanding riding conditions. Its carefully designed internal baffling optimizes exhaust flow, allowing for a more aggressive and responsive throttle response, which translates to improved acceleration and overall engine efficiency. The muffler, featuring a sleek, low-profile design, is engineered to maintain a balanced exhaust note offering a deeper, more engaging growl without sacrificing the nuanced character of the stock system. The slip-on silencer, designed for a snug fit, is both functional and stylish, complementing the aggressive lines of the FZ6 s sporty aesthetic while ensuring a secure attachment. Whether you're seeking a subtle upgrade for daily commuting or a more pronounced exhaust tone for track days, this system provides a harmonious blend of performance and personality. Installation is straightforward, requiring minimal tools and expertise, making it an accessible yet impactful modification for riders looking to refine their bike s voice and character. With its robust construction and attention to detail, the Yamaha 04-54666 exhaust system stands as a reliable choice for enthusiasts aiming to elevate their FZ6 s performance and presence on the road.

### **Pros and Cons of buying a Yamaha 04-54666 (07-09 FZ6 Brothers Exhaust Pipe Header Muffler Slip Silencer)**

1. **Improved Sound Quality** This exhaust system is designed to enhance the mid-range growl of the FZ6, giving it a more aggressive and sporty tone compared to the stock exhaust. Many riders appreciate the deeper, more resonant exhaust note, which can make the bike feel more engaging.

2. **Better Flow and Performance** The slip-on design (header muffler) allows for improved exhaust flow, which can contribute to slight power gains, especially in mid-to-high RPM ranges. This is particularly noticeable in open-throttle scenarios.

3. **Lightweight Construction** The system is made from high-quality stainless steel, which is both durable and relatively lightweight compared to some aftermarket alternatives. This helps maintain handling balance.

4. **Easy Installation** As a slip-on exhaust, it requires fewer modifications than a full cat-back system. It can often be installed without cutting the stock exhaust, though some adjustments may still be needed for a perfect fit.

5. **Compatibility with Stock Components** Since it s a slip-on, it works well with stock catalytic converters (if kept) and other stock exhaust parts, reducing the need for additional upgrades.

6. **Aesthetic Appeal** The design is sleek and matches the aggressive styling of the FZ6, giving the bike a more customized look without being overly flashy.

7. **Reliability** Yamaha parts are generally well-built, and this exhaust system is known for lasting a long time with proper maintenance.

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1. **Limited Power Gains** While there may be slight performance improvements, this is not a high-flow exhaust designed for significant power increases. Expect minimal gains compared to a full cat-back or header-only setup.

2. **Sound May Not Be to Everyone s Taste** The exhaust note is deeper and more aggressive than stock, but some riders prefer a more refined or sporty tone. If you dislike loud, growling exhausts, this may not be ideal.

3. **Potential Fitment Issues** While generally easy to install, some riders report minor fitment challenges, such as gaps or the need for additional gaskets or spacers. A thorough inspection and possible adjustments may be required.

4. **No Backbox or Full Cat-Back Benefits** Unlike a full cat-back system, this slip-on does not include a backbox or complete exhaust housing. If you want a more integrated look or better heat shielding, you may need additional parts.

5. **Legal Considerations** In some regions, exhaust modifications that alter the sound beyond factory specifications may require compliance with local noise laws. Check local regulations before installing.

6. **Cost Relative to Benefits** For the price, some riders feel they could get a more substantial performance upgrade (e.g., a full cat-back or header) for a similar or lower cost.

7. **Maintenance Requirements** Like any exhaust system, it will require periodic checks for rust, leaks, or damaged hangers, especially in wet climates.

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The **Yamaha 04-54666 slip-on exhaust** is a solid choice for riders who want a **moderate sound upgrade, slight performance improvement, and a lightweight aftermarket exhaust** without a full cat-back system. It s well-suited for those who appreciate a **deeper, more aggressive exhaust tone** and don t require extreme power gains. However, if you prioritize **maximum performance, a refined sound, or a complete exhaust overhaul**, you may want to consider alternatives like a **full cat-back system or a header-only setup**.

This exhaust is particularly well-received by **FZ6 enthusiasts who want a balance between aesthetics, ease of installation, and functional benefits** without overcomplicating their build.

- **Buy it if:** You want a **simple, effective sound and slight performance upgrade** without major modifications. You prefer a **slip-on design** and don t mind a slightly louder, growlier exhaust.

- **Consider alternatives if:** You seek **maximum power gains, a more refined sound, or a complete exhaust replacement**. In that case, explore **full cat-back systems (e.g., Akrapovi , MagnaFlow) or header-only setups** for better results.

- **Verify fitment** before purchasing, as some riders report minor adjustments may be needed for a perfect seal.

Overall, this is a **reliable, mid-range option** that delivers on its promises for most FZ6 owners looking for a straightforward exhaust upgrade.

Details:

Expedited shipping services are available upon request. PLEASE REFER TO THE HAND FOR ALL IMPERFECTIONS, OR DAMAGES!, Removed From: 2009 Yamaha FZ6 with UNKNOWN miles, Please review all pictures to inspect the condition of item. 07-09 YAMAHA FZ6 TWO BROTHERS EXHAUST PIPE HEADER MUFFLER SLIP ON CAN SILENCER, This exhaust pipe is in good condition and shows normal signs of wear.

part #: 0454666 price

• $639.99

specifications cyclemufflermo:

• for models: Fz6
• for makes: Can, Yamaha
• for years: 2007-2009
• brand: Yamaha
• mpn: 04-54666
• mounting style: Slip-on
• shape: Oval Straight
• machine type: Street Motorcycle
• material: Stainless Steel
• muffler type: Combination
• vintage part: No
• placement on vehicle: Exhaust
• type: Muffler
• manufacturer warranty: 1 Year
• features: Easy To Replace
• finish: Polished

offer cyclemufflermo:

• best offers: True
• availability: In Stock
• started: April 2, 2026
• quantity: 1
• options: Ship-to-home
• sold: 0

shipping cyclemufflermo:

• service: FedEx Ground / FedEx Home Delivery
• transit: 4-7 Days
• carrier: FedEx
• class: Standard
• cost: $14.00
• type: Fixed

general cyclemufflermo:

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

payments cyclemufflermo:

• other
• wallet: Apple-pay
• credit card: Visa

seller cyclemufflermo:

• rating: 99.8%
• city: Toccoa, Georgia
• # reviews: 14010

returns cyclemufflermo:

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

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