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FMF Q4 S/A Silencer
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FMF Q4 S/A Silencer

Our price: $235.00$326.79

MSRP: $319.99 - $379.99 - You save up to $84.99 (27% off)

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    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 Q4 S/A Silencer Reviews

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0 of 0 people found this review helpful.

Works great

Comments On Feb 27, 2016:It was easy to install. It's much lighter than the stock exhaust on a dr650, and it sounds great. It's definitely louder than the stock, but it's not obnoxious.

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The Best!

Comments On Feb 04, 2016:I use this pipe with the FMF power bomb head pipe on my 400ex. It keeps the sound legal here in WI and still sounds great.

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Great Tone

Comments On Aug 07, 2015:Bought it for a 2006 dual pipe crf250r. Very quiet bike for a 250. The fmf pipe came with detailed instructions as well as all the parts needed and a few stickers. Because it went on a relatively quiet bike the pipe didn't quiet it down a whole bunch but the tone is great. A bit more low end, great pipe if you want a good sound and a little power without making it super loud like a powercore.

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0 of 0 people found this review helpful.

Good but a tight fit.

Comments On Jul 28, 2015:First of all, I paired this up with the FMF Power Bomb exhaust header pipe. This system gets rid of the factory clamp for my bike, so it is a "direct fit" that holds it into place. I had troubles getting the two pipes to seed together perfectly. After about 45 minutes of mounting and un-mounting the pipes and spraying wd-40 at the contact points they finally slipped on and mounted up. Also, the muffler did contact my rear fender so I had to cut some of that away. Also, the FMF customer service line was extremely helpful. All in all it sounds mean, not necessarily louder, just meaner. I am satisfied with this product and Rocky Mountain delivered on time, with the cheapest price ($70) cheaper than anywhere else.

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Comments On Jul 19, 2015:Great sound and easy install...

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0 of 1 people found this review helpful.

Easy install

Comments On Jul 06, 2015:Nice sound and easy to install.

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2 of 2 people found this review helpful.

Good pipe, fit perfect

Comments On Mar 30, 2015:The FMF Q is a big improvement over stock; it's quieter and provides better low-mid hit. The Q is quite a bit longer than stock so the bike has a different look, but the pipe is a nice addition. I'm rating the pipe with a 4 because I was expecting / hoping it'd be more quiet than it is - that being said it is more quiet than stock and has a better overall sound (deeper). I was also expecting a bigger power gain than I felt. All the threads on 2008-2009 YZ450F's say that any aftermarket pipe will add 5 horses, I'm not sure the Q gives that much of a boost. With the Q and a 165 main jet I was better able to wheelie through the deep sandy whoops (4th gear). I also have some peace of mind knowing my pipe is now compliant to state and federal laws regarding noise and spark arrests. Install was easy, I didn't need either of the 2 inserts it came with. The Q simply fit over my header. I used high temp silicon (gasket maker would also work) to seal the 2 pipes together (as listed in the instructions). Install was 15 min. including the time finding my silicon.

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Slip on fmf q4

Comments On Jan 26, 2015:I bought the exhaust to bolt up to my fmf power bomb header and it was a great fit no leaks and loved the tone very mild but no power restriction and fast shipping from Rocky Mountain

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2 of 2 people found this review helpful.


Comments On Dec 03, 2014:This thing is HUGE! From the mounting bolt to the tip of silencer it is 1-3/4 inches longer and weights over a pound more than the stock silencer. If you are looking for performance enhancer I would go with the titanium power core. It has a spark arrester available separately. If all you care about is sound then the Q4 is the one for you.

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Another score for FMF!

Comments On Dec 07, 2014:Great exhaust, I love how loud it is though I've had louder. It really adds the extra umph to the wheeler, Hotcams, the Q4 and a Wiesco high comp piston with this wheeler really turns it into an unstoppable force of nature.

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