Choose a vehicle:

User Tip: If you're unsure of your vehicle type, you may skip the machine type selection box.

» Log in to use your Rider Profile Machines
FMF Hex Q4 S/A Silencer
  • View Larger

    Customer rating on this product:

    Read reviews ( 10 ) | Write a review

    Live Chat Software

    FMF Hex Q4 S/A Silencer

    Our price: $309.59$341.99

    MSRP: $379.99 - You save up to $70.40 (19% off)

    View Product Details

    Select type, make, model and year above

    • "Customer service is priority #1 at Rocky Mountain ATV/MC. We value our customers and strive to be the best shopping experience- when you buy from us, you are buying lifetime service."

      -Dan Thomas, CEO and Founder

    • Returns

      We take pride in offering no hassle returns. In the event of a return, please call, email or chat with us to receive a solution to the problem. For apparel that doesn't fit quite right, Click here to see our Fit Guaranteed Program.

    • Warranties

      We will stand behind all products we sell with regards to manufacturing defects in workmanship and material. Most products are limited to the manufacturer's warranty. However, we will do everything in our power to take care of the problem.

    • Have questions?

      Live Chat: Click here (Leave email if after hours)
      Call us: 1 800 336-5437
      7am-7pm Mon-Fri 8am-4pm Sat (Mountain Standard Time)


      With FMF’s Hex Q4 S/A Silencer, you don’t have to choose between low sound and excellent power.

      FMF has always set itself apart by offering great options to lower your bike’s sound output. The Hex Q4 is no different. With a series of internal baffles, chambers, and sound-absorbing materials, FMF has created a silencer that accelerates exhaust flow while still keeping noise low. So low that most machines will come in well below 96 decibels with some models coming in as low as 92 decibels. While your sound is lowered you are still keeping all of your power, gaining significant weight savings over stock, and a USFS approved spark arrestor.

      So don’t compromise when you need to meet sound and safety regs. Pick up an FMF Hex Q4 S/A Silencer and ride wherever you want.

    • Meets USFS and FIM World Enduro sound regulations
    • No power loss in entire rpm range
    • USFS spark arrestor included
    • Weighs pounds less than stock
    • Rugged design thrives in off-road riding
    • Made in the USA
    • Can be used with stock or FMF header
    • Sound output under 96 dbs and may be as low as 92 dbs

    FMF Hex Q4 S/A Silencer Reviews

    Your review could win you a $100 or $500 gift card!

    Each review submitted enters you into a $100 gift card monthly drawing, and a $500 gift card quarterly drawing!

    0 of 0 people found this review helpful.

    Recommend getting a 4.1

    Comments On Feb 23, 2016:The Q4 restricts the hell out of the engine with the screen in and without it, its unholy because of how loud it is. Not only that but it gives your bike a Cough-and-die syndrome. Entering the corners and exiting my bike would pop and die. Swapped to a 4.1 and it cured the cough and die and gave a much more noticeable power increase.

    Was this review helpful?

    1 of 1 people found this review helpful.

    Sounds great

    Comments On Jan 03, 2016:I love the sound with added power to the ground. I don't like the price but good American stuff is not cheap I suppose. It is not too loud and will not hurt your ears like some pipes. Save your money and go purchase one.

    Was this review helpful?

    0 of 0 people found this review helpful.

    Excellent Product

    Comments On May 04, 2015:Eliminated the back firing on deceleration, smoothed out the power band, great sound (no noticeable increase from stock) and easy to install. The FMF sticker was not fully adhered to the pipe.

    Was this review helpful?

    1 of 1 people found this review helpful.

    Returned for 4.1

    Comments On Jan 30, 2015:FMF is quality stuff, no doubt. I returned the Q4 and went with the 4.1. The Q4 is more of a desert type silencer.. Its long and sticks out of the plastics on new bikes.

    Was this review helpful?

    0 of 0 people found this review helpful.

    nice improvement

    Comments On Aug 22, 2014:A huge improvement over a stock WR exhaust. removeable spark arrestor is nice. The only downside is that the FMF decal on the back is a poor design. Both mine and my buddy's have already came off in about 6 months time.

    Was this review helpful?

    2 of 2 people found this review helpful.

    14 yz 250f

    Comments On Jul 23, 2014:This pipe is nice and quiet. It seems to choke the bike up a bit. I haven't fine tuned the EFI yet. The fit and finish is very good, but it's about six inches longer than the stock pipe and will probably get damaged in a crash on the right side.

    Was this review helpful?

    0 of 0 people found this review helpful.

    Perfect throaty sound!

    Comments On Jun 29, 2014:I waited a while to find the perfect exhaust. Reviews can only give you so much help. What helped me the most was actually hearing different exhausts on my bike. Not taking anything away from the Powercore 4, it was simply a little too loud for my taste. Too raspy at the top end. The Q4 has a tuned throaty sound throughout the rpm range. Plus, it's legal to ride everywhere. Simply another great product from FMF!

    Was this review helpful?

    0 of 0 people found this review helpful.

    Read Before Buying!

    Comments On May 07, 2014:It's a sick exhaust! The sound is just barely deeper than stock but it's noticeable. More noticeable though, is the increase in torque. It definitely breathes better and responds much quicker. It's a big difference. A nice low end upgrade at a decent price. Be aware though, the FMF mounts are placed differently than the stock muffler and do not use the factory hardware. It comes with the bolt you need and everything lines up, it just didn't use the rubber grommets and spacers...they didn't fit. When I installed it, the rear fender plastic was touching the silencer to where it likely would've melted my plastic. To prevent that, I just used a dremel to cut an undetectable amount of plastic off the fender and added a few extra washers in-between the mounting hole on the subframe and plastic and boom! Good to go! Go up a tooth on the rear sprocket with this pipe for a well priced and effective upgrade!

    Was this review helpful?

    1 of 1 people found this review helpful.


    Comments On Feb 12, 2014:It sounds wonderful and I can finally hear other riders when they are getting close.

    Was this review helpful?

    1 of 1 people found this review helpful.


    Comments On Apr 30, 2013:I purchased this for one reason. it was for power... and that's what it gave me... I could tell the difference as soon as I put it on. I suggest it to all riders!

    Was this review helpful?

    RM Cash ProgramParts Finder