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FMF Racing Q4 Spark Arrestor Slip-On Exhaust

Item # : 136094
4.616 Reviews
$376.99 - $901.99
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          FMF Racing Q4 Spark Arrestor Slip-On Exhaust

          Item # 136094


          FMF Racing Q4 Spark Arrestor Slip-On Exhaust

          FMF is the leader in high performance quiet technology and our Q4 is the next evolution in off road exhaust. The Q4 employs intricate chambers, baffles and proprietary multistage packing material making it the best performing quiet muffler available. With the Q4 you don’t need to hear the power, just feel the power!


          • Developed over years of championship off-road racing
          • Max Sound output 96dB; most models below 93dB
          • Mufflerructed from aircraft grade aluminum and high strength stainless steel
          • Use with FMF or Stock OEM Header
          • Removable spark arrestor included


          Rated 5 out of 5 by from Should come as a factory part I installed the FMF Q4 with the FMF PowerBomb and FMF EFI Programmer on my WR250X and noticed a nice increase in power/responsiveness. Nice deep sound too. Not too loud though.
          Date published: 2014-04-19
          Rated 4 out of 5 by from Power without the noise. I bought this to replace the FMF Powercore 4 that was originally installed. The Powercore 4 was way too loud, even after I repacked it. This Q4 pipe is much quieter and I did not notice much of a power difference from the Powercore 4. Same bite with less bark! Only gripe is the cheesy mounting hardware made of thin stamped metal where the header mounts to the frame. The Powercore has a proper threaded bolt on the header for installation to the frame. The Q4's clip stripped easily and now the pipe rubs on the rear shock. Strange that the more expensive Q4 hardware was not as good as the Powercore4. Going to have to contact FortNine or FMF to get a new clip.
          Date published: 2017-08-14
          Rated 5 out of 5 by from Fits 2016 ktm 690 enduro r Bought the newest model i think it was for the 2014 and it fits the 2016 ktm enduro r no problem. Sounds great. Alot louder but not to loud.
          Date published: 2016-08-13
          Rated 5 out of 5 by from Very pleased No problems, happy happy. Quick delivery right to the doorstep.
          Date published: 2018-06-06
          Rated 5 out of 5 by from Excellent Very happy with new FMF exhaust much quieter than my old DG Bullet very good price as well
          Date published: 2018-05-25
          Rated 5 out of 5 by from Perfect sound, perfect volume! I bought this exhaust at the start of the summer (2017) and put it on my 2007 Yamaha YZ450F, as I enjoy riding bush trails and forest roads. I needed a spark arrestor type exhaust, and also wanted something quieter than stock so I wouldn't annoy all of my neighbours at camp. The Q4 ended up being the perfect choice. The power improved a bit on the bike, while the sound is great. It keeps the throaty growl and bark of the thumper we all love, while just reducing the overall volume to manageable levels. Definitely would recommend the Q4 to anyone.
          Date published: 2017-08-10
          Rated 4 out of 5 by from Awesome Slip on exhaust fits 2017 Wr250r with very slight modification. However the included bolts were either to short or to long. Had to cut down factory bolt. Maybe you could add a couple more bolts of different lengths. Sounds awesome! Looks Awesome. Other than shipped with small dent very happy.
          Date published: 2017-08-09
          Rated 4 out of 5 by from Nice sound I wanted something louder than stock. This is the answer. Love the sound and the fit was perfect. Woke the bike up a little too. Overall very nice.
          Date published: 2017-05-04
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          Would it fit straight to the 2018 Suzuki dr650 or do I need to order something else? Thanks 

          Asked by: Jens
          This will fit straight onto your stock or FMF header. There is nothing else that you need to order. Make sure you enter the year, make and model of your vehicle on the product page to receive the vehicle specific part for your application
          Answered by: LeeH
          Date published: 2019-09-11

          What jet is recommended with this muffler?

          Asked by: Buzz
          It depends on your bike. Two stroke or four. I went up one size for both the main and pilot and adjusted the mixing screw. Best to check the forums for your particular bike. You may find that you don’t need to rejet at all if it’s running to your liking. Good luck. 
          Answered by: Mongoose
          Date published: 2019-08-21
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