FMF Q4 Full Exhaust System

Item Number: 302669


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Product Description

FMF Racing

FMF Q4 Full Exhaust System

FMF has always been a leader in high-performance quiet technology and the FMF Q4 is no exception to that mantra. With a design that features various patents pending, this is one of their most technically advanced exhaust systems. Inside the Q4 muffler intricate chambers, baffles and proprietary multistage packing material making it the best performing quiet muffler available on the market today. With the Q4, you don't need to hear the power, but you will certainly feel the power!

  • Developed over years of championship off-road racing experience to produce power with minimal sound
  • Max sound output 96 dB
  • Significantly lighter than the stock exhaust system
  • Aircraft grade aluminum muffler sleeve, high strength stainless steel end caps and a chrome steel header
  • USFS-approved spark arrestor
  • Easily serviced for repacking
  • Made in the USA

Spec Details
Configuration Single
Country of Origin USA
Header Hi-Flo
Header Construction Stainless Steel
Muffler End Cap Stainless Steel
Muffler Sleeve Aluminum
Spark Arrestor Screen Insert (included)

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.


  • TRX250X FourTrax 250X 1987-1988, 1991
  • TRX300EX FourTrax 300EX 1993-2000, 2004-2007
  • TRX300EX Sportrax 300EX 2001-2003, 2008
  • TRX300X Sportrax 300X 2009

Customer Reviews

Questions & Answers

  • Is it loud?

    By: Guest

    In most cases, FMF Q4 exhausts are quieter than the stock exhaust system. This is due to the fact that the FMF Q4 is specifically designed to be more nature-friendly while at the same time, improving exhaust gas flow over stock and thereby allowing for greater power output and better throttle response.

    By: Staff

  • Do you need to reject the carburetor. What sizes for stock 97 TRX300EX?

    By: Andy

    Yes, we highly recommend that you re-jet your ATV in order to get the best power gains possible upon the installation of this FMF TRX300EX exhaust. For this particular system, we recommend a TRX 300EX FMF POwer Up Carburetor Jet Kit. In it, you'll find everything you need to get the most out of your Honda ATV along with easy-to-follow installation instructions.

    By: Staff