C
What is the quietest KTM 4 stroke exh out there? FMF's "Q" series?
Quiet 4 stroke exh?
- Thread starter Comp 670
- Start date
R
It's not FMF 4.1 on a KX.... that's for sure. My Pro Circuit T5 is surprisingly quiet.
C
Im gathering a list of things for my build and a quiet exh is at the top of the list. I was at Baker a few years ago and two sno bikes rode by. I could hear them a LONG ways away, they were incredibly loud. (way louder then any sled I have owned and I rode mod sleds for a long time) I am assuming they both had blown out packing in their silencers and or full on "race" setups with no spark arrestor or muffler. I just don't want to be "that guy" who pisses everybody off with a loud bike.
C
Is your Pro Circuit T5 quieter then the stock exh?
none that quiet
that's one of the annoying issue about most the sno bikes, that stupid loud 4 stroke exhaust note.
they could be better if pointed down towards the snow, built a couple of aluminum end caps to do that, but power robbing although quiets down that riding off in the distance endless thumper noise.
dinky muffler sizes on bikes is part of the issue, 4 stroke noise just really carries, 4 stroke sleds too.
that's one of the annoying issue about most the sno bikes, that stupid loud 4 stroke exhaust note.
they could be better if pointed down towards the snow, built a couple of aluminum end caps to do that, but power robbing although quiets down that riding off in the distance endless thumper noise.
dinky muffler sizes on bikes is part of the issue, 4 stroke noise just really carries, 4 stroke sleds too.
C
I'm for sure going to do what I can to make it as tolerable as possible. Once I get the bike and kit mounted I will look into aiming the exh at the ground like most sleds. I do think that would help a lot. Should be fairly easy to do, I have built a ton of stainless headers for race cars so I hope to be able to do this.
L
loud bikes save lives. bikes in general should all be loud. someone can hear you coming or you can hear someone else coming down the trails or wherever. Its not like you are riding in town. who cares what other people think if you are brapping in the country.
C
A lot of riding areas have been closed because of attitudes like that... where I ride sound issues are a big deal and I am just trying to do my part to help keep our areas open.
T
Go back to riding sleds
C
I haven't heard a Pro Circuit, I run a FMF Q4 and has a nice sound, not nearly as ear piercing as stock MX mufflers. Avoid 2 brothers as well, had one and it was way too loud even with fresh packing.
P
I have the same issue my Yosh pipe works well for power but sucks for noise
The stock YZ is quieter than my WR with the Yosh pipe.
So far all I have done resulted in a loss of power -- the YZ is next already a bit quieter and will try a different end cap as soon as I have the snow Kit on.
Keep us up to date on mods and mufflers that might work.
The stock YZ is quieter than my WR with the Yosh pipe.
So far all I have done resulted in a loss of power -- the YZ is next already a bit quieter and will try a different end cap as soon as I have the snow Kit on.
Keep us up to date on mods and mufflers that might work.
K
My UTV customers have struggled with this for years. The simple and cost effective fix is to use some sort of turn down on the exit. This will bounce the sound down. It does rob about 2-3 hp but the noise factor goes way down.
Kelly, I can't believe you missed the chance. Clearly the best way to limit exhaust noise is to add a turbo. It does reduce the sound dramatically in all honesty.
3
The quietest 4 stroke exhaust I've seen for KTM's is the stock exhaust. Particularly the XCW and EXC mufflers.
M
Sometimes it's not all exhaust noise, my 09 husaberg 570 has amodified air intake through the seat as the air box sits directly under it. When you crack that throttle and get on it, it is literally ear splitting. Ear plugs are mandatory. I gutted the stock exhaust and repacked it, no spark arrester or anything, just a straight shot out. Both mods helped performance. Trying to get these thumpers breathing and quite is a challenge. Maybe the $6000.00 turbo option ...ouch! I'll stick with the $2.00 earplugs for now.
N
you are the reason why the treehuggers want to close all of our trails.
anyway,
The stock exhaust on my Husaberg FE390 (says KTM on the exhaust) is very quiet, I sold my Akrapovic to keep the DB's down.
Quietest aftermarket I have seen is the LEXX from rockymountain with the trail saver tip. It was ~88db on my WR450
Not sure how quiet it is in the real world but the end caps promoto billet sells you can get inserts and it looks like the KTM one points down towards the ground.
http://www.promotobillet.com/p-18643-spark-arrestor-endcaps.html
http://www.promotobillet.com/p-18643-spark-arrestor-endcaps.html
Definately same page I am on.
I love ripping the bikes, and I love a nice crips exhaust note, but after a day of WOT My head is ringing even without ear plugs. Get to the trail without em, gotta head back, sucks. Get a larger OD pipe and do a turn down. not the nicest looking thing, but it helps keep the sound from carrying so dang far.
Also, your not making friends with loud bikes. I know lots of guys want to act tough and pretend it doesn't matter, but whether you like it or not, it does affect you. Don't be a bone head and make noise just because you think its cool.
I love ripping the bikes, and I love a nice crips exhaust note, but after a day of WOT My head is ringing even without ear plugs. Get to the trail without em, gotta head back, sucks. Get a larger OD pipe and do a turn down. not the nicest looking thing, but it helps keep the sound from carrying so dang far.
Also, your not making friends with loud bikes. I know lots of guys want to act tough and pretend it doesn't matter, but whether you like it or not, it does affect you. Don't be a bone head and make noise just because you think its cool.
N
I had the promoto deal with the turn down quiet cap on my WR450, it worked well for a stock exhaust, but I think the KTM exhaust with the Krizman spark arrestor is a good balance of quiet/power. What bike do you have?