exhaust for 21 gasgas 450mc

bad juju
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bad juju
Edited Date/Time 8/20/2022 4:59pm
looking to put an exhaust on my mc450, looking for help on what you guys put on and where it moved the power at. also i am not a rev type of rider. thanks.
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183Matt
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183Matt 8/19/2022 4:48pm
8/19/2022 4:48pm
Stock KTM is a decent upgrade if you can get it cheap. Yosh is smooth and mellow, FMF feels better down low, and PC feels better in the upper ranges. Those were my observations.
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luckypunk
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luckypunk 8/19/2022 4:58pm
8/19/2022 4:58pm
why do you want to change exhaust? spark arrestor? or power? Rich Piana gainz are had with ECU
1
whitechapel44 8/19/2022 4:59pm
8/19/2022 4:59pm


Best thing I ever did to my bike was adding the full fmf system to my bike! Gave the bike way more snap and better throttle response and recovery.
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bad juju
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bad juju 8/19/2022 5:07pm
8/19/2022 5:07pm
luckypunk wrote:
why do you want to change exhaust? spark arrestor? or power? Rich Piana gainz are had with ECU
just make it a little fatter on the bottom and while keeping it big and smooth into the upper midrange.

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bvm111
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bvm111 8/19/2022 5:18pm
8/19/2022 5:18pm
get a Vortex from XPR or Twisted development… way more bang for the buck
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mx317
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mx317 8/19/2022 5:37pm
8/19/2022 5:37pm
bvm111 wrote:
get a Vortex from XPR or Twisted development… way more bang for the buck
8 to 12 week wait right now.
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TeamGreen
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TeamGreen 8/19/2022 5:39pm
8/19/2022 5:39pm
I’ve got a stock KTM header & muffler…also an FMF slip-on…if you’re interested.

Also, get the KTM/Husky map switch it allows access to more maps and t/c.
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wrc777
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wrc777 8/19/2022 7:48pm
8/19/2022 7:48pm
If it is like the 250, the ktm header eliminates a bog in the low to mid and a bit less snap right off idle. If the muffler has the ice cream cone in it you can take it out. There are videos on YouTube.
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Shawn142
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Shawn142 8/20/2022 8:13am
8/20/2022 8:13am
Even if you take the cone restrictor out of the stock exhaust the bike starts to pop a little. Just put a pipe on and you'll get flame-out issues. Really need to match a pipe with an ECU tune so it doesn't run ragged.
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bad juju
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bad juju 8/20/2022 2:43pm
8/20/2022 2:43pm
Shawn142 wrote:
Even if you take the cone restrictor out of the stock exhaust the bike starts to pop a little. Just put a pipe on and you'll...
Even if you take the cone restrictor out of the stock exhaust the bike starts to pop a little. Just put a pipe on and you'll get flame-out issues. Really need to match a pipe with an ECU tune so it doesn't run ragged.
I am guessing that the ktm, husky and gasgas have the same ecu. if that is so the ktm and husky have pipes on them from the factory. are those bikes having any issues? fmf slip-on was looking like the one I was going To do. what do you think?
bvm111
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bvm111 8/20/2022 4:59pm
8/20/2022 4:59pm
bvm111 wrote:
get a Vortex from XPR or Twisted development… way more bang for the buck
mx317 wrote:
8 to 12 week wait right now.
I would still recommend to wait for the Vortex over the exhaust even with the wait.
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moto67e
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moto67e 8/21/2022 3:42pm
8/21/2022 3:42pm

I have the FMF full system and the Twisted Development exhaust flange on my 21 MC450. I'm a 50+ Intermediate and like this set up a lot. I had a Yamaha 450 before my GasGas and liked the harder hitting power of my Yamaha. The FMF system made my GasGas feel more like the Yamaha. I feel like the stock GasGas is too smooth.




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TeamGreen
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TeamGreen 8/21/2022 3:53pm
8/21/2022 3:53pm
Shawn142 wrote:
Even if you take the cone restrictor out of the stock exhaust the bike starts to pop a little. Just put a pipe on and you'll...
Even if you take the cone restrictor out of the stock exhaust the bike starts to pop a little. Just put a pipe on and you'll get flame-out issues. Really need to match a pipe with an ECU tune so it doesn't run ragged.
bad juju wrote:
I am guessing that the ktm, husky and gasgas have the same ecu. if that is so the ktm and husky have pipes on them from...
I am guessing that the ktm, husky and gasgas have the same ecu. if that is so the ktm and husky have pipes on them from the factory. are those bikes having any issues? fmf slip-on was looking like the one I was going To do. what do you think?
If you get the KTM/Husky Map/TC Switch, you can use the other maps that're already in your ECU.
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Knuth123
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Knuth123 9/26/2023 2:58am
9/26/2023 2:58am
TeamGreen wrote:
I’ve got a stock KTM header & muffler…also an FMF slip-on…if you’re interested. Also, get the KTM/Husky map switch it allows access to more maps and...
I’ve got a stock KTM header & muffler…also an FMF slip-on…if you’re interested.

Also, get the KTM/Husky map switch it allows access to more maps and t/c.

Do you still have these?

cwtoyota
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cwtoyota 9/26/2023 12:31pm
9/26/2023 12:31pm
TeamGreen wrote:
I’ve got a stock KTM header & muffler…also an FMF slip-on…if you’re interested. Also, get the KTM/Husky map switch it allows access to more maps and...
I’ve got a stock KTM header & muffler…also an FMF slip-on…if you’re interested.

Also, get the KTM/Husky map switch it allows access to more maps and t/c.

I've ridden Husky and KTM 450s and played with map switch modes...
Map 2 allows the bike to accelerate through the power a little quicker.  It's a big improvement on deep or rutted tracks, especially if you like to lug the bike a bit.

Having just come back in my shop from riding my MC350F, I'm 100% onboard with the map switch install.
My track is soft / sandy with steep jumps out of corners (Arenacross meets Southwick) and I just got a ton of rain.
Map 2 with TC turned on is well worth the price of admission on these GasGas four bangers when it's a little soft and slick like it is here today.

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