Old 22nd July 2019, 06:26 PM #1
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Removing catalytic converter. Ktm 1090

Hello.

I'd appreciate any experience with decating a ktm 1090 or any bike.

The cat on the bike is welded on the header side (RHS of pic) of the cat but on the can side it's just pressed into place. (LHS of pic)

At least that's how it looks to me. Theres no weld all the way round and there is a gap visible on the bottom.

How are these normally put together?

Would the cat be inserted into the link pipe.
Then the link pipe inserted into the headers and the pipe mechanically pressed closed?

I want to gut the cat and looking online others have cut out the entire piece and welded a pipe in its place. If needed the cat can in be welded back in place.

Looking at mine I was wondering if I could just cut off the pressed side (about 10mm) and pull the link pipe out and drill out the cat itself?

Or. What is the best and cheapest way to remove it?
Arrow sell a decat pipe buts it's €525!!

Any thoughts be welcome. Cheers.




Last edited by Chickenhawk; 22nd July 2019 at 06:30 PM.
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Old 23rd July 2019, 09:22 AM #2
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Re: Removing catalytic converter. Ktm 1090

Is the guy who makes exhausts not still on the forum?
Sure he could make a decat piece for half that
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Old 23rd July 2019, 11:22 AM #3
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Re: Removing catalytic converter. Ktm 1090

Arrow exhausts do a huge selection of decat pipes / headers.
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Old 23rd July 2019, 01:33 PM #4
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Re: Removing catalytic converter. Ktm 1090

Originally Posted by kwackquack
Is the guy who makes exhausts not still on the forum?
Sure he could make a decat piece for half that
Gizmo is the lads name... not sure if hes still about or not though
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Old 23rd July 2019, 04:28 PM #5
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Re: Removing catalytic converter. Ktm 1090

He's still about.
Recently did some fabrication work on my Arrow race bik e system.
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Old 23rd July 2019, 09:11 PM #6
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Re: Removing catalytic converter. Ktm 1090

Cheers.
I'll pm gizmo.

Thinking I might just get the cat cut out completely and get a pipe welded in place of it. Looks to be easiest.

The arrow decat headers are €525.
Too steep just to get rid of the cat imo.
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Old 24th July 2019, 09:55 AM #7
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Re: Removing catalytic converter. Ktm 1090

Maybe I'm missing something - why ?
Are cats that unreliable / performance sapping etc that you're going to notice?

Genuinely curious - seems like there's at most marginal benefit in real-world use cases?
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Old 24th July 2019, 09:57 AM #8
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Re: Removing catalytic converter. Ktm 1090

Makes most bikes very quiet. And I find slightly hesitant on the throttle on low applications
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Old 24th July 2019, 10:29 AM #9
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Re: Removing catalytic converter. Ktm 1090

The lc8 responds well to a decat,sounds much better too
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Old 24th July 2019, 11:22 AM #10
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Re: Removing catalytic converter. Ktm 1090

I'm not looking to increase power.

I'm trying to get rid of the heat from the cat.
It sits right by my foot and can get very hot if stopped or slow riding.


A better air intake will be put on next as the stock airbox is poor and can allow dust in. With increased fueling the cat may end up hotter still and even damaged.

And noise.
I like loud noises. :)
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