Best exhaust 19 kx450

racerofmx527
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El Mirage, AZ, USA
racerofmx527
Time to order a full system, bike is stock. Looking at akrapovic but not sure about FMF or Yosh

Not going to go w pro circuit as my last system didn’t hold up for sh!t

Thoughts?
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coastie44
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coastie44 2/17/2021 11:55am
2/17/2021 11:55am
I bought the full Yosh system that Keefer tested a while ago and it's the first exhaust I have bought in years that really impressed me. More power from low to mid across the board. I'm not constantly banging off the rev limiter so can't tell you much about what it did to the top end, but I put it on halfway through a track day and I found I needed to adjust where and when I was shifting because it added so much more oomph.
quadzrulebro 2/17/2021 12:08pm
2/17/2021 12:08pm Edited Date/Time 2/17/2021 12:10pm
Whatever you get, make sure it is rubber mounted before you buy it. The stock system has rubber grommets that absorb flex and vibration. If you mount an aftermarket exhaust that won’t accept these rubber grommets, it is just a matter of time before either the muffler or subframes fails.
This has been well documented over and over again here: https://www.vitalmx.com/forums/Moto-Related,20/Lets-see-review-those-20…
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racerofmx527
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racerofmx527 2/17/2021 12:32pm
2/17/2021 12:32pm
quadzrulebro wrote:
Whatever you get, make sure it is rubber mounted before you buy it. The stock system has rubber grommets that absorb flex and vibration. If you...
Whatever you get, make sure it is rubber mounted before you buy it. The stock system has rubber grommets that absorb flex and vibration. If you mount an aftermarket exhaust that won’t accept these rubber grommets, it is just a matter of time before either the muffler or subframes fails.
This has been well documented over and over again here: https://www.vitalmx.com/forums/Moto-Related,20/Lets-see-review-those-20…
My pc system I drilled out the mount and added the grommet, been through the broken sub frame on the first system. Thank you though
1
Markee
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Markee 2/17/2021 3:40pm
2/17/2021 3:40pm
DM Alex Ray.

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coastie44
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coastie44 2/17/2021 4:45pm
2/17/2021 4:45pm
racerofmx527 wrote:
My pc system I drilled out the mount and added the grommet, been through the broken sub frame on the first system. Thank you though
Yosh has the rubber grommet so all good there!
1
wesmx272
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Fredericksburg, VA, USA
wesmx272 2/19/2021 4:52pm
2/19/2021 4:52pm
I have had both the FMF factory 4.1 TI and the Rocket system both make good power ... here is the difference I think ... I think the FMF hits harder however it does put the power to the ground like the rocket does with throttle roll on ... both seem to be quality systems and durable .. the Rocket Muffler is the best in the business and far as being able to easily rebuild it ... I have had PC FMF and Rocket on my sons 250s ... the Rocket is much easier to rebuild than those other two PC you have to send back or drill it out ...FMF comes apart with Allen heads .. however not fun to do ... neither FMF or Rocket has a rubber grommet ...I reinforce my subframes .. 20 bucks .. at the local welder ... no issues ... do I think you would be happy with any one of these systems ... yes ... will you have more money in your pocket after buying a rocket ... yes ... probably about 400 more ... anyway just my opinion ...
2
racerofmx527
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racerofmx527 2/19/2021 5:25pm
2/19/2021 5:25pm
wesmx272 wrote:
I have had both the FMF factory 4.1 TI and the Rocket system both make good power ... here is the difference I think ... I...
I have had both the FMF factory 4.1 TI and the Rocket system both make good power ... here is the difference I think ... I think the FMF hits harder however it does put the power to the ground like the rocket does with throttle roll on ... both seem to be quality systems and durable .. the Rocket Muffler is the best in the business and far as being able to easily rebuild it ... I have had PC FMF and Rocket on my sons 250s ... the Rocket is much easier to rebuild than those other two PC you have to send back or drill it out ...FMF comes apart with Allen heads .. however not fun to do ... neither FMF or Rocket has a rubber grommet ...I reinforce my subframes .. 20 bucks .. at the local welder ... no issues ... do I think you would be happy with any one of these systems ... yes ... will you have more money in your pocket after buying a rocket ... yes ... probably about 400 more ... anyway just my opinion ...
How do the rockets hold up these days? Had a deal with them probably about 15 years ago and they were junk, the cans fell apart in less than 4 hours and I tossed them in the trash. They do look good nowadays, I’ll give them that
navalseabee
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navalseabee 2/19/2021 5:29pm
2/19/2021 5:29pm
I liked the look, sound and feel of my Bills setup i had on my 2019. Just one more option to consider, its rubber mounted also.
1
ElliotB16
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Cairo, GA, USA
ElliotB16 2/19/2021 5:37pm
2/19/2021 5:37pm
PC system with white coupler has a ton of bottom end. I would stay away from FMF exhaust on a 19/20

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