Gold Series Fatty™ Pipe

The FMF Gold Series Fatty™ Pipe is FMF Racing’s most popular 2-stroke expansion chamber, built on decades of racing experience to deliver performance you can actually feel on track or trail. By broadening and smoothing the power curve, it helps your bike pull cleaner across the rev range—giving you more usable low-end torque, a stronger mid-range hit, and improved over-rev for faster exits and easier gear choices.

If you’re looking for more tractable power and better throttle control—especially in changing traction or technical sections—the Fatty is designed to make the engine easier to ride while still adding gains throughout the entire power band.

Key features:

• ✅ Race-proven performance that broadens and smooths the power delivery
• ✅ Carbon steel construction with a nickel-plated finish for maximum durability
• ✅ FMF Tru-Flo stamping process for a precise fit and optimum performance

Benefits of use:

• 🔹 More controllable power delivery for improved throttle feel and traction
• 🔹 Power gains across the whole RPM range (low, mid and over-rev)
• 🔹 Durable plating and accurate fitment for reliable long-term use

Technical specifications:

• 📌 Design/Configuration: 2-Stroke
• 📌 Material: Steel (nickel-plated finish)
• 📌 Includes: O-rings

Why choose this product?

• ⭐ Developed from over 35 years of racing experience for proven results
• ⭐ A go-to upgrade when you want a wider, smoother, faster powerband
• ⭐ Easy to pair with an FMF or stock silencer (unless otherwise noted)

Note: Will not pass 2025 FIM sound regulation.