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

$287.99 - $350.99
10% Off - Save up to $39.00

Item #FMF001G

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37 Reviews
4.5 out of 5 stars
5 Star   25 4 Star   10 3 Star   0 2 Star   1 1 Star   1
All Reviews
AtomicClox Verified Purchaser
1 month 5 days ago
Ease of Installation4/5Performance5/5Power5/5Style5/5
Works well, sounds great

Slip on, but the factory clamp does NOT work. I used a hose clamp and it worked. Good sound, and added power.

Dirtridder Verified Purchaser
3 months 29 days ago Northern Michigan
Durability5/5Ease of Installation5/5Performance5/5Power5/5Style5/5
Love the sound and the increased power!

4#s lighter than stock and looks Great on the bike.

4 months 21 days ago Missouri
Durability4/5Ease of Installation3/5Performance4/5Power4/5Style4/5
Sound good

Love the sound
Came with the wrong size bolt for 2017 wr250r.
By the rear foot peg is the missing bolt..

Osamu Verified Purchaser
Over 5 months ago
Durability5/5Ease of Installation5/5Performance5/5Power5/5Style5/5


TrainWreck Verified Purchaser
Over 7 months ago Ventura Ca.
Durability5/5Ease of Installation5/5Performance5/5Power5/5Style5/5
Easy installation nothing to modify

I put the pipe on my 2018 WR250R about a month ago, really easy to install, It bolted right up , the bike has more power than it had with stock pipe , Well worth the investment

Over 8 months ago Spokane wa
Durability4/5Ease of Installation3/5Performance5/5Power5/5Style5/5
Great slip on!

I put this on my 2000 xr650l in June 2018. 6 months and 3000 miles later I am very pleased with this unit! I left the stock header pipe and added the Q4. The difference in the sound compared to the stock muffler is big! I love the way my xr
literally barks now! Not as quiet as advertised. Doesn't bother me.
I did bash it on a rock one day when I crashed on some single track trails. It's pretty tough so I can attest it's pretty sturdy. Just a scratch.
Buy it for your xr!!

Braap Verified Purchaser
Over 9 months ago White Lake MI
Durability3/5Ease of Installation3/5Performance3/5Power1/5Style2/5
Nice muffler

Bought the fmf q4 for a 2014 wr250r. Wakes the bike up nicely!

Over 10 months ago Eugene or
Durability5/5Ease of Installation4/5Performance5/5Power5/5Style5/5
Looks great!

The price was a bit crazy in my opinion $350 but other than that I have put around 500 miles on the fmf q4 so far on my 1998 klr 650 and I love the look of it, the sound is just right and it feels like the bike has a bit more power too! I'm glad I got the fmf q4 muffler.

Gj_brit Verified Purchaser
1 year 4 months ago Wa
Durability5/5Ease of Installation5/5Performance5/5Power4/5Style5/5
FMF Q4 Exhaust for HondaXR650L

Pipe fit great with no issues. Sounds great. Louder Han stock but not too loud. Also install the FMF joe-jet kit so not running lean

Bologna1 Verified Purchaser
1 year 4 months ago Iowa
Durability5/5Ease of Installation5/5Performance5/5Power5/5Style5/5
Great exhaust!

Good directions, easy install on Suzuki DRZ400S. Sound and noise level is good with spark arrester installed. Also installed K&N air filter and stage 2 jet kit. Good power increase in mid and high rpm.

See 10 More Reviews
20 Questions
Answered:   19
Not Yet:   1
Q: I need a quiet insert but I can't find the part, I bought a bike with a Q4 on it but it's way too loud as the spark arrestor insert has been removed, I've got neighbours throwing bricks at me to shut me up, please help!
Over 6 months ago
Top 10
Over 6 months ago
A: FMF HEX Q4 Quiet Core Spark Arrestor Insert (part number 040671) is a replacement that will most likely help you out the most. That should really quiet up the motorcycle, and make the angry brick throwing neighbors chill out!
Q: How does this seal up to the powerbomb header for my 2004 crf250r? Is it a gasket or silicone
Over 7 months ago
Top 10
Over 7 months ago
A: Their should be a muffler connection gasket to seal the two.
Q: I have a 1998 honda xr250r. The guy who had the bike before me deleted the diffuser. Wanted a quiet exaust and not too worried about power loss. Is this a good muffler for me or what do yall reccomend
Over 8 months ago
Top 10
Over 8 months ago
A: That model would be the quietest muffler we offer for your model.
Q: What kind of jet kit would be recommended for this exhaust for my 2006 Suzuki LTZ 250 
1 year ago
Top 25
1 year ago
A: You will need to contact your local mechanic since jetting is based off of location and what the bike is lacking. Here is a jet kit we do offer for your machine https://www.motosport.com/moose-dynojet-jet-kits
Q: I am looking to make my crf250x louder what would be a good choice thank you
1 year 1 month ago
Top 25
1 year 1 month ago
A: Giving us a call at 1-888-676-8853 and we can better discuss the options!
Q: Is this a quite exhaust? 07 crf150r
1 year 7 months ago
I’m looking to make my crf150r quitter is this a good slip on to go with or are there quiter ones?
Top 25
1 year 7 months ago
A: The Q4 is a quiet exhaust with a Max Sound output 96 dB, most models below 93 dB. I am not aware of a quieter exhaust on the market today.
Q: Will the bolt straight on to my 510 TXE husqvarna 09
2 years 8 months ago
Q: Fitment
Over 3 years ago
Will this pipe slip on my stock crf230f? And will I have to rejet it with the all stock?
MotoSport Staff Expert
Over 3 years ago
A: Just be sure to correctly select the Year/Make/Model of your bike before ordering so we can be sure to send you the correct muffler for your bike. Normally when installing a slip-on only minor jetting changes are needed, if any at all. If your bike is currently jetted properly you will likely not have to make any changes after installing this slip-on. I would recommend installing the exhaust and riding the bike to see how it is running then tuning your carburetor from there if necessary. Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
Q: Will this fit a 2007 Suzuki LT-Z250?
Over 3 years ago
MotoSport Staff Expert
Over 3 years ago
A: Yes. Just be sure to correctly select the Year/Make/Model of your ATV before ordering so we can be sure to send you the correct exhaust for your ATV. Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
Q: Will this fit on a Honda 2000 300 ex
Over 3 years ago
Expert MotoSport Staff
Over 3 years ago
A: Yes the FMF Q4 Spark Arrestor Slip-On Exhaust fits your 2000 Honda TRX300EX. Just be sure to correctly select the Year/Make/Model of your ATV before ordering so we can be sure to send you the correct exhaust for your ATV. Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
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# Part Numbers
Product Variant Manufacturer Part #
Aluminum 041287
Aluminum 041249
Aluminum 041332
Aluminum 041365
Aluminum 041255
Aluminum 043236
Aluminum 043208
Aluminum 043211
Aluminum 042156
Aluminum 043207
Aluminum 045124
Aluminum 042116
Aluminum 042118
Aluminum 043203
Aluminum 044285
Aluminum 044286
Aluminum 041330
Aluminum 041331
Aluminum 044437
Aluminum 041338
Aluminum 044232
Aluminum 044195
Aluminum 044199
Aluminum 044291
Aluminum 044210
Aluminum 044301
Aluminum 041333
Aluminum 041337
Aluminum 041339
Aluminum 042320
Aluminum 042321
Aluminum 043206
Aluminum 044288
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.