MBRP AT-6406SP Sport Series Slip-On Exhaust for 02-08 Yamaha Grizzly 660F

Vehicle Fitment

• 2002-2008 Yamaha YFM660F Grizzly 4x4 ATV

Features

• Sport Series slip-on exhaust system with chambered muffler design
• Direct replacement for stock muffler on Grizzly 660F 4x4
• Black-coated aluminized steel construction resists corrosion
• Straight-core design enhances exhaust flow and sound quality
• Produces a balanced, deeper exhaust tone with moderate volume
• Bolt-on installation - no tuning or major modification needed
• Sport Series 1-year limited warranty
• Improves overall exhaust performance and throttle response

Specifications

• Part Number: AT-6406SP
• Application: Sport Series Slip-On Exhaust with Muffler
• Compatible Vehicles: Yamaha YFM660F Grizzly 4x4 (2002-2008)
• Material: Black-coated aluminized steel
• Exhaust Type: Slip-on sport muffler
• Installation: Bolt-on, no tuning required
• Sound Profile: Moderate deeper tone
• Warranty: 1-year limited Sport Series coverage

Included Components

• 1x Sport Series Slip-On Exhaust (AT-6406SP)
• Clamps and mounting hardware

Product Description

The MBRP AT-6406SP Sport Series Slip-On Exhaust is a **direct-fit performance upgrade** for the **Yamaha YFM660F Grizzly 4x4 ATV** covering model years **2002 through 2008**. Designed to replace the factory muffler with a chambered Sport Series slip-on, this exhaust improves flow while producing a deeper, more engaging sound without excessive loudness, making it ideal for trail riding and everyday recreational use. 

Constructed from black-coated aluminized steel, the AT-6406SP offers durability and corrosion resistance essential for off-road conditions. Its straight-core, chambered design enhances exhaust efficiency and delivers a balanced, moderate tone that enhances throttle feel and overall exhaust performance. The bolt-on installation requires minimal tools and no engine tuning, and the system is backed by a 1-year limited Sport Series warranty for peace of mind.