FMF Factory 4.1 Slip-On Muffler 044400 - Yamaha YFZ450R / YFZ450X 2009-2026

Product Description

If performance is your absolute priority, the FMF Factory 4.1 is the exhaust system built for you. Trusted and utilized by top professional factory teams such as KTM, Epic Can-Am, and Rath Racing, it delivers elite competition-level performance.

Constructed with a lightweight anodized blue titanium muffler body and a durable stainless steel pipe, this slip-on features a carbon fiber Euro end cap. It is designed to accept optional quiet inserts and spark arrestors, and can be used directly with your stock header or an FMF Powerbomb or Megabomb header.

Top Features: FMF Factory 4.1

• Engineered specifically for riders who make maximum performance their top priority.
• Proven track record used by elite factory racing teams like KTM, Epic Can-Am, and Rath Racing.
• Built with a lightweight titanium muffler canister featuring a striking anodized blue finish[cite: 1].
• Equipped with a high-grade carbon fiber Euro end cap and stainless steel piping[cite: 1].
• Designed to accept optional spark arrestors and quiet inserts, compatible with stock, Powerbomb, or Megabomb headers[cite: 1].

Please review the detailed compatibility data below to ensure an exact fitment match for your vehicle before finalizing your purchase.

Fitment List

Frequently Asked Questions

Q: Can this slip-on muffler be used with a stock header?
A: Yes, it is designed for use with the FMF Powerbomb, FMF Megabomb, or the stock OE header[cite: 1].

Q: Does this muffler accept quiet inserts or spark arrestors?
A: Yes, it is engineered to accept optional quiet inserts and spark arrestors depending on your riding requirements[cite: 1].

Expert Pro-Tip

Expert Pro-Tip: When installing a slip-on muffler on a high-performance quad, apply a thin bead of high-temperature silicone sealant at the slip-joint connection between the midpipe and header to prevent exhaust leaks. Always check and retighten mounting bolts after the first heat cycle.

Recommended Pairings:

• Yamaha Raptor 700R / YFZ450R Performance Parts
• All Quads & ATV Performance Parts
• Motorcycle Tools & Accessories

About Moto-House MX

At Moto-House MX, we carry the best brands in motocross and off-road performance. Our team has over 40 years of experience helping riders get more out of their bikes. We pride ourselves on great customer service, and every item ships FAST - straight to your door.

Moto-House MX - Choice of Champions - Your premier powersports source with great customer service and lightning-fast shipping straight to your door.