FMF 044016 Powercore 4 Slip-On Muffler — Yamaha YFM660R Raptor 660 (2001-2005) Performance

FMF 044016 — Powercore 4 Slip-On Performance Muffler for Yamaha YFM660R Raptor 660 — Optimized Power, Lightweight Durability, and Track-Proven Versatility

Revitalize your classic Yamaha Raptor 660 with the FMF 044016 Powercore 4 Slip-On Muffler. Engineered to unlock the hidden potential of your YFM660R, this slip-on is designed to increase horsepower and torque across the entire power curve. Whether you are attacking technical trail sections, ripping through open dunes, or just looking for a more responsive machine, this muffler delivers a noticeable power boost that is both manageable and highly effective for every style of riding.

The Powercore 4 is engineered for the perfect balance of weight reduction and structural longevity. It features a high-grade aluminum canister paired with a durable stainless steel Hi-Flo endcap, ensuring the system can handle the intense heat and vibrations of high-performance ATV riding. For riders who enjoy diverse terrain, the included removable spark arrestor ensures that you remain compliant with public land regulations while maintaining the signature, aggressive FMF exhaust note. With its anodized champagne finish, this slip-on is as visually striking as it is mechanically superior.

• Power-Curve Optimization: Developed to provide a smooth, broad increase in both horsepower and torque for improved throttle response and acceleration on the Raptor 660.
• High-Strength Construction: Lightweight aluminum canister paired with a rugged stainless steel Hi-Flo endcap for long-lasting durability.
• Trail-Ready Versatility: Includes a removable spark arrestor, allowing you to quickly switch between closed-course racing and legal trail riding.
• Signature Aesthetics: Features a sleek anodized champagne finish that complements the classic styling of your Yamaha Raptor 660.
• Precision Engineering: Designed specifically as a direct slip-on upgrade for easy installation on 2001-2005 Yamaha YFM660R Raptor models.
• Proven FMF Quality: Built with decades of racing heritage to ensure performance consistency and reliability under the most demanding conditions.

Moto-House MX Pro Tip:

Upgrading to a slip-on is the quickest way to shed weight and improve your engine's breathing. Installation Tip: Always clean the slip-joint connection thoroughly and use a high-temp exhaust gasket or sealant to ensure a tight, leak-free seal that maximizes performance. Tuning Advice: Because this is a high-performance upgrade for the Raptor 660, we recommend checking your carburetor jetting. A simple jet kit adjustment will ensure your engine maintains an optimal air-fuel ratio, preventing lean conditions and extracting the maximum power gains.

Technical Specs	Construction	Compatibility
Slip-On Design	Aluminum/Stainless Steel	Yamaha YFM660R Raptor
Oval Style	Anodized Champagne	2001-2005 Models
Weight: 6.28 lbs	Removable Spark Arrestor	Riding Style: ATV

FAQ Questions

Q) Is this muffler street legal?
A) This Powercore 4 slip-on is designed as an off-road performance part. Please check local regulations regarding sound and emissions for your specific riding area.

Q) Do I need to re-jet my carburetor for this slip-on?
A) While not always mandatory for slip-ons, we highly recommend verifying your jetting. A slight adjustment to your main jet will ensure the engine runs cool and produces the intended power increases.

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