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100cell vs Catless?

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Old Jan 4, 2026 | 07:52 AM
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Default 100cell vs Catless?

Hi all!

Currently have Europipe 100cell downpipes paired with the JCR titanium non-valved exhaust on my 992.1 4S.

Am looking for a bit more volume (tone is perfect with the JCR, just want louder).

Has anybody gone from catted to catless? If so, was it obnoxiously loud? My M4 was catless and obnoxiously loud.

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Old Jan 4, 2026 | 07:59 PM
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I have one with stock cats, and another with JCR 200 cell race cats, buddy has a cat delete targa GTS and I have listened to them all side by side.

obnoxious? I don’t think so. It is a 3.0L after all. The biggest difference I have heard is you pick up a lot more whistle from the turbo. It is marginally louder but not so different that you can’t get used to it. Aside from that the sound difference you do pick up the smell.
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Old Jan 4, 2026 | 08:28 PM
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Thank you for the insightful response. I already have quite a bit of turbo spool w/ the 100cell and JCR non-valved... sounds like catless might not yield THAT much more volume...
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Old Jan 5, 2026 | 11:57 AM
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Originally Posted by JMW4
I have one with stock cats, and another with JCR 200 cell race cats, buddy has a cat delete targa GTS and I have listened to them all side by side.

obnoxious? I don’t think so. It is a 3.0L after all. The biggest difference I have heard is you pick up a lot more whistle from the turbo. It is marginally louder but not so different that you can’t get used to it. Aside from that the sound difference you do pick up the smell.
Maybe I’m just particularly sensitive to smells, but even the 100 cell sport cats are a bit too stinky for my liking. Running catless wouldn’t work for me. @JMW4 is definitely right to point out the odor factor as something you should seriously consider.
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Old Jan 5, 2026 | 05:52 PM
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I genuinely don't smell anything with my 100cell cats. My catless G82 M4 on the other hand... that was stinky!
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Old Jan 6, 2026 | 11:26 AM
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I went from 50 cell europipes + stock muffler to 3" BRE custom turbo back setup. Obviously big differences there + inconel tone.

I will say in terms of raw sound you won't notice much under 4k rpm. I actually think the turbo whistle was just slightly louder between the 50 cell and catless for me. Couple people who had heard my car on the old setup certainly couldn't tell a difference in a parking lot.

Above 4k rpm though, definitely way louder and tone differences, but that is more so a product of the 3" setup and BRE inconel tone.

Prob not worth switching if you're already happy and aren't planning a major change to the system anyways.
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Old Jan 6, 2026 | 01:57 PM
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I personally do not like catless sound, it makes the exhaust louder, but it ruins the sound in my opinion. its too raspy and unrefined
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Old Jan 7, 2026 | 05:42 PM
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Originally Posted by X-PH.COM - MIKE
I personally do not like catless sound, it makes the exhaust louder, but it ruins the sound in my opinion. its too raspy and unrefined
haha Mike crazy seeing you here. I bought so many products off you for my G82 on BimmerPost.

im gonna stick with current setup - it sounds amazing just not quite as loud as I’d prefer!
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Old Jan 7, 2026 | 05:56 PM
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Originally Posted by Andy.c.d
haha Mike crazy seeing you here. I bought so many products off you for my G82 on BimmerPost.

im gonna stick with current setup - it sounds amazing just not quite as loud as I’d prefer!
Haha Good seeing you here too. Appreciate all the support on the G82 side, lets keep it strong on the Porsche side as well LOL


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Old Jan 8, 2026 | 03:42 AM
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Originally Posted by Andy.c.d
Thank you for the insightful response. I already have quite a bit of turbo spool w/ the 100cell and JCR non-valved... sounds like catless might not yield THAT much more volume...
A tune will make it sound louder and more aggressive and you can switch to 50 cell cats as well !
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