Yamaha YFZ450 ATV 04-10 FMF Factory 4.1 SL (Slip-On)

Yamaha ATV Parts, Exhaust Parts for Yamaha ATVs

FMF Factory 4.1 Slip On

The Factory 4.1 is FMF Racing's premier ATV performance exhaust. It is guaranteed to produce more horsepower throughout the entire RPM range. If performance is your priority, the Factory 4.1 is the exhaust for you.

• Titanium construction with durable stainless steel midpipe
• Used by Factory teams such as KTM, Epic Can-Am and Rath Racing
• Optional quiet insert or spark arrestor available
• Use with FMF Powerbomb or Megabomb, or stock header