FMF is the leader in high performance quiet technology and our Q4 HEX is the next evolution in off road exhaust. The Q4 employs intricate chambers, baffles and proprietary multistage packing material making it the best performing quiet muffler available. With the Q4 you don’t need to hear the power, just feel the power!

-Less sound equals more ground

-Meets USFS and FIM World Enduro sound regulations

-Power gains throughout the entire rpm range

-Spark arrestor included

-Pounds lighter than stock

-Rugged design for off-road endurance

-Only US manufacturer to offer dedicated quiet exhaust systems

-MADE IN THE USA

Item ID:044442
Type:Slip-On
Configuration:Single
Const:Aluminum
Finish:Anodized Gun Metal Gray
Midpipe:Stainless Steel
Endcap:Stainless Steel
Spark Arrestor:Screen Insert (included)
Carb Warning:no
Quiet Insert:Included
Weight:5.7 lbs.

Includes FMF MegaBomb Stainless Exhaust Pipe # 044475

Item ID:044475
Type:Header
Configuration:Single
Carb Warning:no
Header Const:Stainless Steel
Header Type:MegaBomb

Fitment: 

Yamaha YZ450F 2023 2024

Yamaha YZ450FX 2024