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

Our price: $260.99$323.99

MSRP: $289.99 - $359.99 - You save up to $36.00 (10% off)

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  • "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

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    The FMF Q4 S/A silencer offers a low sound output, yet it still offers exceptional power gains. The Q4 silencer puts out 94db or less and also has a USFS approved spark arrestor with no screen to clean or screen to burn through. The FMF Q4 S/A silencer has more packing volume so you have longer time between repacking. So take the noise out of riding with the Q4 S/A silencer and not the fun.
  • Developed over years of championship off-road racing. Constructed with aircraft grade aluminum and high strength stainless steel.
  • Max sound output 96db, most models below 93db.
  • Comes standard with spark arrestor. Easily serviced for repacking.
  • Use with stock or FMF head pipe.

FMF Q4 S/A Silencer Reviews

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0 of 0 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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0 of 0 people found this review helpful.

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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1 of 1 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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0 of 0 people found this review helpful.

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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0 of 0 people found this review helpful.

FMF Silencer

Comments On Jan 10, 2014:The silencer makes good power and meet a 98 dec sound test.

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1 of 1 people found this review helpful.

Huge power gains!

Comments On Dec 31, 2013:I have this silencer on my 2013 RMZ450 and my 2009 RMZ450 and it is amazing. I pair it with a power-bomb head pipe and I notice big HP gains from bottom to top end. I believe it is much more quiet then stock but has a better sound. Two thumbs up FMF I would definitely recommend. My only complaint is that the sticker has started to peel off but I stuck it back down with heat resistant epoxy and it looks as good as new!

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0 of 1 people found this review helpful.

verry good product

Comments On Nov 21, 2013:verry good sound

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0 of 0 people found this review helpful.

really woke up the bike

Comments On Aug 30, 2013:I put this on my DRZ, not know as a fast powerful bike by any means. The combination of this + the Q4 silencer and a rejetting of the carb significantly improved throttle response. Made the bike much easier to control sliding around on gravel corners, blip of the throttle allows me to control just the right amount of oversteer.

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0 of 0 people found this review helpful.

Just what I expected

Comments On Jul 12, 2013:Looks great and went on easy. I also paired this silencer with a FMF Megabomb. The bike is a lot quieter with noticeable power gains.

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0 of 1 people found this review helpful.


Comments On May 29, 2013:FMF Q4 with FMF jet kit really woke up my quad and saw noticable gains in power. I was expecting it to be alott louder like some competitors but it was not. If you are looking for a nice quiet pipe that give you power this is for you.

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