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FMF Racing Q4 Hex Slip-On Muffler

Item: 357236-16774499

$404.99

Select Your Vehicle - Fitment Guaranteed

FMF Racing Q4 Hex Slip-On Muffler


The FMF Q has always been in a league of its own and the Q4 HEX is the most significant upgrade to date. Don't settle for a plugged-up moto muffler hampered by a power-robbing exhaust insert when you can have a compliant muffler that's engineered for performance. More power, with less noise in a nifty HEX-shaped muffler design. FMF 's Q4 HEX is proof that FMF is the only US manufacturer to offer dedicated quiet exhaust systems.

  • Fits stock or FMF headers
  • Meets USFS and FIM World Enduro sound regulations
  • Less sound means you can travel without worries of getting a ticket from The Man
  • Rugged aluminum sleeve muffler design for off-road endurance
  • Power gains throughout the entire RPM range
  • Includes USFS-approved spark arrestor and 94 dB sound insert
  • Lighter than stock, with added power
  • Made in the USA
Specification Details
Color Clear
Country of Origin USA
Finish Anodized
Mid-Pipe Stainless Steel
Muffler End Cap Stainless Steel
Muffler Sleeve Aluminum
USFS Approved Spark Arrestor Yes

Vehicle Fitment


Fitment is guaranteed or your money back plus free return shipping.
Don’t waste time installing a product that doesn't fit. We worked hard ensuring that this product is an exact fit on the vehicles listed below.

Yamaha
  • WR450F 2019-2020
  • YZ450F 2018-2025
  • YZ450FX 2019-2025

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Questions & Answers

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Will the carb need to be rejetted

Stock 2012 klx 250.

Typically, it is not necessary to re jet for just a slip-on.

By Andy
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