FMF Powercore 4 Slip-On Muffler – Yamaha Raptor 660 (2001–2005)

🛠️ Description
The FMF Powercore 4 was developed to bring out the best in your Yamaha Raptor 660. Built from lightweight aluminum with stainless steel Hi-Flo endcaps, this slip-on delivers a strong boost in horsepower and torque across the entire RPM range. The Powercore 4 is known for its crisp, throaty tone and versatile performance that works for every riding style — from dunes and trails to track days. Includes a removable U.S.F.S. approved spark arrestor for legal off-road use.

✅ What’s Included

• FMF Powercore 4 Slip-On Muffler

• Removable spark arrestor

• Mounting hardware

📦 Fitment

• 2001–2005 Yamaha YFM660R Raptor 660

🛡️ Warranty Info
FMF exhausts are backed by one of the most trusted names in performance. Warranty covers defects in materials and workmanship. Wear, discoloration, and repacking needs are excluded as normal maintenance.

🔑 Key Features

• Boosts horsepower & torque across the powerband

• Aluminum muffler body with anodized champagne finish

• Stainless steel Hi-Flo endcaps for strength and flow

• Aggressive performance sound with strong mid-range pull

• U.S.F.S. approved spark arrestor included

• Lightweight design – only 6.28 lbs

• Bolts directly to stock headpipe