FMF 044224 Powercore 4 Aluminum Slip-On Muffler With Spark Arrestor — Yamaha YFZ450 UTV

FMF RACING — Premium Anodized Champagne Aluminum Oval Muffler, Stainless Steel Hi-Flo Endcap, and Removable Spark Arrestor for Yamaha YFZ450 Sport ATVs

Unleash instant throttle response, increased power, and an aggressive exhaust note on your machine with the FMF 044224 Powercore 4 Slip-On Muffler. The restrictive stock muffler limits exhaust flow and traps excessive heat, choking your engine's true capabilities. Engineered specifically for the iconic Yamaha YFZ450, the Powercore 4 is designed to optimize exhaust scavenging, yielding a noticeable boost in horsepower and torque throughout the entire power curve. Whether you are blasting through dunes, tracking on a motocross course, or tackling tight woods, this slip-on silencer delivers a highly usable power increase compatible with any UTV riding style.

Built to bridge the gap between premium performance and rugged durability, the Powercore 4 features a lightweight aluminum canister finished in a sleek anodized champagne coating. This aluminum body is paired with a heavy-duty stainless steel mid-pipe and a Hi-Flo conical endcap, providing the ultimate structural balance of strength and weight reduction. Precision mechanical engineering ensure it effortlessly handles the heavy chassis vibrations and punishing sand blasting common to sport quad riding. Adding excellent trail versatility, FMF includes a removable spark arrestor screen within the canister, allowing you to quickly switch between unrestricted closed-course race tracks and noise/fire-regulated public off-road riding areas.

• Broad Power Gains: Formulated to increase horsepower and torque cleanly across the low, mid, and top-end power bands.
• Sleek Champagne Canister: Lightweight oval aluminum body features an anodized champagne finish for superior corrosion defense.
• Stainless Hi-Flo Endcap: Conical stainless steel endcap optimizes internal flow dynamics and increases structural durability.
• Removable Spark Arrestor: Includes a built-in screen spark arrestor to maintain legal compliance in forestry and public trail spaces.
• Substantial Weight Savings: Noticeably lighter than the bulky OEM factory steel silencer assembly, improving chassis agility.
• Direct Bolt-On Fitment: Specifically engineered to slip directly onto the stock headpipe of 2004-2009 and 2012-2015 Yamaha YFZ450 models.

Moto-House MX Pro Tip:

The carbureted Yamaha YFZ450 responds incredibly well to exhaust upgrades, but freeing up the exhaust flow means your motor will naturally pull more air. To prevent your quad from running too lean and to maximize your horsepower gains, we strongly recommend checking your carburetor jetting. Pairing this FMF slip-on with a slightly richer main jet and a high-flow intake filter will completely transform your quad's mid-range pull. Installation Tip: When mounting this slip-on, clean the headpipe junction thoroughly. Apply a thin bead of high-temperature copper silicone gasket sealant to the slip-fit joint before clamping it down to guarantee a 100% leak-free exhaust seal. Maintenance Advice: High-performance four-stroke mufflers rely on internal fiberglass packing to maintain power and acoustic depth. To prevent the aluminum shell from overheating and discoloring, replace your silencer packing every 30 hours of hard riding.

Muffler Architecture	Material Profile	Primary Compatibility
Performance Slip-On Muffler	Anodized Champagne Aluminum Body	Yamaha YFZ450 (Sport ATV / UTV)
Hi-Flo Conical Configuration	Stainless Steel Mid-Pipe & Endcap	Model Years: 2004-2009, 2012-2015
Weight: 6.6 lbs	Removable Screen Spark Arrestor	Stock Headpipe Match

FAQ Questions

Q) Will this FMF slip-on muffler bolt directly up to the newer fuel-injected YFZ450R models?
A) No, this slip-on is engineered and dimensioned strictly for the standard carbureted YFZ450 models (2004-2009, 2012-2015). The fuel-injected YFZ450R utilizes a completely different subframe layout, mounting points, and exhaust pipe routing.

Q) Does this exhaust system include the front header pipe or reuse the factory hardware?
A) This is a slip-on system, meaning it includes the mid-pipe and muffler canister designed to bolt directly onto your stock original header pipe. It does not include a replacement front header pipe.

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