FMF Factory 4.1 — Slip-On — Honda CRF150R (2007-2026), 4-Stroke

The Factory 4.1 is FMF Racing's premier performance exhaust. With 30 years of racing experience behind it, the Factory 4.1 takes advantage of everything learned on the race track.

• Horsepower gains throughout RPM range
• Available with titanium or high strength stainless steel midpipe
• 94dB Insert Included

Type: Slip-On

Construction:Titanium

Finish: Blue Anodized

Midpipe: Titanium

Endcap: Stainless Steel

Spark Arrestor: Insert (sold separately)

Weight:3.4 lbs.

Notice: Closed Course Use Only

Slip-on. Replaces the stock muffler and bolts to the stock header or an FMF MegaBomb/PowerBomb header, sold separately. Header not included.

This is a 4-stroke exhaust. It is engineered for the 4-stroke engine architecture above and physically will not fit a 2-stroke bike. Verify your engine type before purchase.