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FMF Q4 Hex Spark Arrestor Slip-On Exhaust
FMF Q4 Hex Spark Arrestor Slip-On Exhaust

$265.77 - $431.99
10% Off - Save up to $48.00
Rating: 4.6 out of 5 stars

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      Item #FMF002Z

      23 Reviews

      4.6 out of 5 stars
      •   17 reviews
      •   3 reviews
      •   3 reviews
      •   0 reviews
      •   0 reviews

      All Reviews

      nickmell

      Verified Purchaser
      1 month 13 days ago Md
      3 out of 5 stars
      Durability
      3/5
      Ease of Installation
      5/5
      Performance
      4/5
      Power
      4/5
      Style
      4/5
      Sounds good, welds are questionable.

      Bought this to fix the terrible raspy stock silencer on 2017 yz250f. It did a great job of making the bike sound good, not a whole lot quieter but a much more pleasant tone.... The welds on the other hand look like something you would find in a high school welding class, I was thinking about returning but Im able to reweld if there is issues so I decided to keep it. Overall I'd give it 4 stars for sound and 3 for quality.

      Paul

      Verified Purchaser
      1 month 21 days ago Georgia
      3 out of 5 stars
      Durability
      4/5
      Ease of Installation
      1/5
      Performance
      3/5
      Power
      3/5
      Style
      5/5
      Not Direct Fit ...

      This pipe fits INTO the midpipe, whereas the stock pipe fits OVER the midpipe. So .. the OEM clamp WILL NOT FIT. Guess I have to use a home depot clamp or something ? Also at rear, the OEM hat bushings and OEM rubber bushing will not fit, the flange is far too narrow. So I guess you just bolt on metal to metal ?

      I havent been able to run this pipe yet for these 2 issues, maybe I will just return but why isnt this part compatible with a 2013 KX250F ? Its also heavier than the stock pipe by a considerable amount.

      Overall I would of just stuck with OEM pipe, not sure what the advantage of this is, especially considering its less than ideal fit.

      Big Mac

      Verified Purchaser
      Over 6 months ago Reedley, Ca
      5 out of 5 stars
      Durability
      5/5
      Ease of Installation
      5/5
      Performance
      5/5
      Power
      5/5
      Style
      5/5
      Spark Arrestor

      I bought this FMF spark arrestor and I am very happy with it, it fits perfectly and sounds great

      Macusfish

      Verified Purchaser
      Over 7 months ago Baja California
      3 out of 5 stars
      Durability
      3/5
      Ease of Installation
      2/5
      Performance
      4/5
      Power
      3/5
      Style
      4/5
      On the fence

      The exhaust clamp on my 2016 yz250f didn’t fit as the slip on suggests. It made installing the exhaust pretty frustrating and I feel like ive had to rig the bike until I find a permanent solution

      Jdwa

      Verified Purchaser
      Over 7 months ago Mn
      5 out of 5 stars
      Durability
      5/5
      Ease of Installation
      5/5
      Performance
      5/5
      Power
      5/5
      Style
      5/5
      Great product

      It cuts off weight and has a significant power increase.

      PhighLow

      Top 500 Verified Purchaser
      1 year ago Augusta Ga
      5 out of 5 stars
      Durability
      5/5
      Ease of Installation
      5/5
      Performance
      5/5
      Power
      4/5
      Style
      5/5
      Quieter than stock

      I got this for the spark arrestor for riding in places where required and to meet or beat the 96db threshold for certain hare scrambles/enduros. I was under the impression I could just bolt this on and not do any mapping changes to the efi on my 2013 RMZ 250...we'll it is true, though I did get a bog on a throttle blip one time before it was warmed up fully, again just once on the 1st trip out with it. This had never happened before.Hasn't happened since and I've had it out 3x since. So the verdict is still out on that but pretty sure it's good. I noticed a lot of low end gain but the same time I got the Q4 I went up two teeth on rear sprocket so can't attribute all of the extra grunt to the exhaust. With all that said I love the sound, perceived low end gain, and ability to ride and race places where I couldn't with out it.

      Wapas

      Verified Purchaser
      1 year ago Placerville
      5 out of 5 stars
      Durability
      4/5
      Ease of Installation
      5/5
      Performance
      4/5
      Power
      4/5
      Style
      5/5
      Good looking pipe, perfect fit

      This installed very easy. It does not use the clamp in the center. The pipe is not real quiet, but not real loud. I wish it was quieter, but it is not bad. It is a good looking pipe, plus it takes care of my spark arrestor.

      Icedaddy

      Top 250
      1 year 4 months ago Eugene, OR
      4 out of 5 stars
      Durability
      4/5
      Ease of Installation
      3/5
      Performance
      5/5
      Power
      5/5
      Style
      4/5
      Greal Product and lighter then stock.

      Nothing but praise for this. There are a few quirks to it though one of them being that it does not come fully assembled, so you need to be careful not to throw anything out by accident. By not fully assembled I'm talking about the spark arrestor insert. Coming to quirk number two they used an allen head instead of a 6mm/8mm so installing the insert is more of a pain then it should be. Quirk number three you will most likely need to by a hose clamp and install it where the pipe meets the muffler.

      Hoppykins4567

      Verified Purchaser
      1 year 4 months ago Muskegon, Mi
      4 out of 5 stars
      Durability
      4/5
      Ease of Installation
      4/5
      Performance
      5/5
      Power
      5/5
      Style
      4/5
      Perfect fit

      I bought this for my 2012 rmz250 to ride in the trails and dunes and it fits perfect. The bike has more power and sounds great.

      Ricky

      Verified Purchaser
      1 year 8 months ago Nevada City Ca
      5 out of 5 stars
      Durability
      5/5
      Ease of Installation
      5/5
      Performance
      5/5
      Power
      5/5
      Style
      5/5
      FMF q4

      Great exhaust with a good sound

      16 Questions

      • Answered:   12
      • Not Yet:   4

      Question asked by fernando

      Question: Can you ship this muffler to the Philippines?
      Question asked 3 months 3 days ago
      Question answered by robert
      User's contributor status: Top 10
      Question answered 3 months 3 days ago
      Answer: Due to size and customs restrictions some items are not available for international shipment; consequently you may see items available for sale on our U.S. site, but not on our international site.

      Question asked by Hophead

      Question: Has anyone put this on the 2019 Honda crf450?
      Question asked Over 9 months ago
      Question answered by DaveGearhead
      User's contributor status: Top 10
      Question answered Over 9 months ago
      Answer: This muffler is not tied to that particular fitment. No idea if someone went against better judgement and tried it on their own.

      Question asked by Jayz

      Question: Does this fit on the new CRF 150L here in Philippines?
      Question asked Over 11 months ago
      Question answered by robert
      User's contributor status: Top 10
      Question answered Over 11 months ago
      Answer: This exhaust will not fit a crf 150l.

      Question asked by BradenH54

      Question: So the spark arrestor is already built into the pipe itself? 
      Question asked Over 11 months ago
      Question answered by Michael
      User's contributor status: Top 10
      Question answered Over 11 months ago
      Answer: It does come already installed, that is correct. You will still be able to remove and replace if need be.

      Question asked by Curious

      Question: Is this slip on stamped U.S.F.S. use?
      Question asked Over 11 months ago
      Question answered by Paul
      User's contributor status: Top 1
      Question answered Over 11 months ago
      Answer: The FMF Q4 Hex Spark Arrestor Slip-On Exhaust Meets U.S.F.S. and FIM World Enduro sound regulations. FMF includes a sticker which shows that the muffler meets the U.S.F.S. requirement, which you may apply to the muffler, or not.

      Question asked by SethBlanchard

      Question: I have a 2018 YZ250F and the stock clamp is too big for the slip on. Any help here?
      Question asked 1 year 8 months ago

      Question asked by Dalton

      Question: EFI Programmer
      Question asked 2 years 11 months ago
      If I install this with the Megabomb header, should I go and buy an EFI programmer, or reprogram the injectors? What EFI box do I need or what fuel map do I need to download?

      Question asked by Danno

      Question: Could you please identify the difference between the "Q4 HEX" and standard "Q4"
      Question asked 2 years 12 months ago

      Question asked by whitey

      Question: Is the slip on stamped FOR U.S.F.S. ?
      Question asked Over 3 years ago
      fmf Q4 hex spark arrestor slip-on muffler

      Question asked by maxcrf250l

      Question: Is the Q4 Street legal in the EU (Germany)?
      Question asked Over 3 years ago
      Or maybe a hint where/how to best check? Thanks
      Question answered by MotoSportExpert
      User's contributor status: Expert MotoSport Staff
      Question answered Over 3 years ago
      Answer: All products sold on MotoSport.com are for US models only. We unfortunately do not have product fitment for non-us models. Also any street legal products are designed for US emissions and laws.
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      Fitment

      See all bikes that this part fits...

      # Part Numbers

      Product Variant Manufacturer Part #
      FMF Q4 Hex Spark Arrestor Slip-On Exhaust 045442, 041486, 042296, 043325, 043345, 043326, 044387, 044426, 044388, 044413, 041516, 043338, 045556, 045590, 042328, 044398, 044435, 045565, 042346, 041568, 041570, 042341, 043363, 044442, 042368, 044452, 041578, 043371, 045627

      California Proposition 65

      WARNING: This product contains chemicals known to the State of California to cause cancer, and birth defects or other reproductive harm. Wash hands after handling. For more information, go to www.P65Warnings.ca.gov.