Shortening muffler

Lunch_Box
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Lunch_Box
Edited Date/Time 2/27/2022 8:14am
So besides the obvious of the bike being louder is there any other negatives (performance...) to shortening the muffler on a 4 stroke? I have a 2016.5 KTM 450 and can't stand how far the muffler sticks out so was thinking of taking off 2 inches.
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Paw Paw 271
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Paw Paw 271 2/3/2017 9:14pm
2/3/2017 9:14pm
It will work fine. No issues.

Paw Paw
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CarlinoJoeVideo
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CarlinoJoeVideo 2/4/2017 8:25am
2/4/2017 8:25am
It might change the power delivery a hair but 2inches most be hard to feel.
1
mattyhamz2 2/4/2017 8:32am
2/4/2017 8:32am
Both Joe and Paw Paw,

Does your knowledge ever end? lol. Every time I come in here you guys are always sharing so much knowledge its crazy! Joe, let's go ride again soon. Next good rain and i'll take you up to bean!
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Lunch_Box
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Lunch_Box 2/4/2017 10:48am
2/4/2017 10:48am
Thanks. I didn't think it would have any other issues other than noise but wanted to check before cutting it up.

The Shop

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Paw Paw 271
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Paw Paw 271 2/4/2017 10:53am
2/4/2017 10:53am
You really will not even notice the noise as you will be speeding away from it on the track, and it is really not much.

Paw Paw
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Lunch_Box
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Lunch_Box 2/4/2017 11:15am
2/4/2017 11:15am
More just noise in general, didn't want it to be obnoxious. Now to cut a brand new FMF muffler.
Ktm 5
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Ktm 5 2/4/2017 11:23am
2/4/2017 11:23am
I was told before if you take 3 inches off it would help bottom end but I didn't have the guts to cut ours up
Paw Paw 271
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Paw Paw 271 2/4/2017 12:08pm
2/4/2017 12:08pm
Take no more that 4" off.

Paw Paw
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Lunch_Box
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Lunch_Box 2/4/2017 12:11pm
2/4/2017 12:11pm
Ya I don't think there is enough room to take off that much without doing some serious modifications. Just trying to keep it simple, so max out the most I can take out back to the rear hanger bracket. 2"-3" at most, make it so just the carbon end cap is sticking out past the number plate.
Braiden_Cheers 2/25/2022 7:07pm
2/25/2022 7:07pm
Hey guys, any of you's got a photo of how the exhaust looks shortened?? Thanks
Digger29
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Digger29 2/26/2022 8:22am
2/26/2022 8:22am
Here's my GasGas with 2.5" cut from the FMF can. We ran it on the Dyno with the standard length FMF can and the shortened can was quite a bit better right off idle. I have the chart somewhere but it's definitely a decent mod for a quicker hit. I didn't notice that it was any louder over than the standard length can.
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Oleary465
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Oleary465 2/26/2022 6:47pm
2/26/2022 6:47pm
Digger29 wrote:
Here's my GasGas with 2.5" cut from the FMF can. We ran it on the Dyno with the standard length FMF can and the shortened can...
Here's my GasGas with 2.5" cut from the FMF can. We ran it on the Dyno with the standard length FMF can and the shortened can was quite a bit better right off idle. I have the chart somewhere but it's definitely a decent mod for a quicker hit. I didn't notice that it was any louder over than the standard length can.
is that the Kings bike?
Braiden_Cheers 2/27/2022 1:57am
2/27/2022 1:57am
Digger29 wrote:
Here's my GasGas with 2.5" cut from the FMF can. We ran it on the Dyno with the standard length FMF can and the shortened can...
Here's my GasGas with 2.5" cut from the FMF can. We ran it on the Dyno with the standard length FMF can and the shortened can was quite a bit better right off idle. I have the chart somewhere but it's definitely a decent mod for a quicker hit. I didn't notice that it was any louder over than the standard length can.
Thanks mate, that looks awesome! Ill be getting onto it as soon as possible. You wouldnt have a link to the new sticker would you? Ive had a look around but cant seem to find the right one for that exact pipe. Thanks
Digger29
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Digger29 2/27/2022 8:11am
2/27/2022 8:11am
Digger29 wrote:
Here's my GasGas with 2.5" cut from the FMF can. We ran it on the Dyno with the standard length FMF can and the shortened can...
Here's my GasGas with 2.5" cut from the FMF can. We ran it on the Dyno with the standard length FMF can and the shortened can was quite a bit better right off idle. I have the chart somewhere but it's definitely a decent mod for a quicker hit. I didn't notice that it was any louder over than the standard length can.
Oleary465 wrote:
is that the Kings bike?
Yes, it is. I work on it quite a bit because you certainly know that he doesn't :-)
Digger29
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Digger29 2/27/2022 8:14am
2/27/2022 8:14am
Digger29 wrote:
Here's my GasGas with 2.5" cut from the FMF can. We ran it on the Dyno with the standard length FMF can and the shortened can...
Here's my GasGas with 2.5" cut from the FMF can. We ran it on the Dyno with the standard length FMF can and the shortened can was quite a bit better right off idle. I have the chart somewhere but it's definitely a decent mod for a quicker hit. I didn't notice that it was any louder over than the standard length can.
Braiden_Cheers wrote:
Thanks mate, that looks awesome! Ill be getting onto it as soon as possible. You wouldnt have a link to the new sticker would you? Ive...
Thanks mate, that looks awesome! Ill be getting onto it as soon as possible. You wouldnt have a link to the new sticker would you? Ive had a look around but cant seem to find the right one for that exact pipe. Thanks
I get the FMF can decals from AOMC. They have many different styles of FMF can decals in stock so you could change up the look quite a bit if you wanted too.
PaulG
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PaulG 12/12/2022 12:07pm
12/12/2022 12:07pm

Digger29 - What did you use to cut the Titanium FMF?  

Jrey2
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Jrey2 12/13/2022 8:44am
12/13/2022 8:44am

I've recently done this as well. I used a stock husky exhaust, removed the backfire screen, and put it in a large bandsaw. Cut it slowly and be sure to mark the bolt holes BEFORE cutting. Use a little grill paint to touch up the cut edge and reinstall. Louder, and ever so slightly better off the bottom. Plus, the black looks way better. On austrian 350's you'll want to cut 1.25 inches.

Jrey2
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Jrey2 12/13/2022 8:51am
12/13/2022 8:51am
Jrey2 wrote:
I've recently done this as well. I used a stock husky exhaust, removed the backfire screen, and put it in a large bandsaw. Cut it slowly...

I've recently done this as well. I used a stock husky exhaust, removed the backfire screen, and put it in a large bandsaw. Cut it slowly and be sure to mark the bolt holes BEFORE cutting. Use a little grill paint to touch up the cut edge and reinstall. Louder, and ever so slightly better off the bottom. Plus, the black looks way better. On austrian 350's you'll want to cut 1.25 inches.

Seems like one photo at a time now on the new update. 

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Jrey2
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Jrey2 12/13/2022 8:54am
12/13/2022 8:54am
Jrey2 wrote:
I've recently done this as well. I used a stock husky exhaust, removed the backfire screen, and put it in a large bandsaw. Cut it slowly...

I've recently done this as well. I used a stock husky exhaust, removed the backfire screen, and put it in a large bandsaw. Cut it slowly and be sure to mark the bolt holes BEFORE cutting. Use a little grill paint to touch up the cut edge and reinstall. Louder, and ever so slightly better off the bottom. Plus, the black looks way better. On austrian 350's you'll want to cut 1.25 inches.

Jrey2 wrote:
Seems like one photo at a time now on the new update. 

Seems like one photo at a time now on the new update. 

I also used the cricut to cut some gasgas logos that go on the husqvarna cover up section. 

XC706 12/16/2022 9:38am
12/16/2022 9:38am
PaulG wrote:

Digger29 - What did you use to cut the Titanium FMF?  

Also wondering how you cut the Ti can. Looking to do the same with a Ti Akra muffler.

kpersonius264 12/16/2022 2:32pm
12/16/2022 2:32pm

I have an old muffler that is pretty trashed and this post gave me some inspiration to fix it up. Decided to shorten it 2” with a cutoff wheel

 

 

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