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Old 07-27-2009, 07:15 PM   #1
spoony_prelude
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To Remove the cat or not (Audi related)



Hey guys

Ok, so when I bought my audi back in november it passed emissions with flying colours. But the cars always felt to me like its being super restricted. I know I'm used to driving the bimmer sporting a 8.5lbs flywheel, and 3.2l to boot, but I still feel as if the audi has power waiting to be unleashed. I have a wierd feeling that my cat may be plugged as I had a minor leak last winter with the audi right at the downpipe and it seemed to give the car a little bit more pep to it.

But I've also heard vw's/audi's need back pressure. So im debating whether or not I should pull the cat or not. My next e-test is due august 2010 so not worried about that now, and also I had a mechanic with a passat wagon vr6 awd tell me my car would pass without the cat since theyre doing a sitting test. Apparently his vr6 passed with no cats. My motor runs well! at 317k, I can go a full oil change interval (5-6k synthetic) with only half a liter of oil lost.

Any ideas or input is greatly appreciated!!!

Thanks

Jay
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Old 07-27-2009, 07:19 PM   #2
325isdan
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cats are not restrictive if they are in proper working order.
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Old 07-27-2009, 08:09 PM   #3
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I would leave it on, don't think you will gain much by it.

No luck selling it?
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Old 07-27-2009, 08:22 PM   #4
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^^^I havent really been trying, after i changed the distributor the cars been running/starting like a charm. Then I start watching old quattro video's on youtube and I imagine mountains of snow, lol. I've actually gotten quite a few e-mails/calls about the car asking if its still available.

But then I start asking myself, for 2gs what else can I really buy which brings awd, heated leather/mirrors, power everything... So I just keep it. That and also I think about driving it in the snow and man, with memories driving up dufferin while everyone just sits there struggling to move, its hard to let go.

Thanks for the input guys

Jay
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Old 07-28-2009, 09:12 AM   #5
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You wanna bring it to some rally crosses? I am going in september.
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Old 07-28-2009, 10:43 AM   #6
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I took my cat off for a while and felt noticable gains, nothing crazy but definetly slight gains. If your only street driving I would leave it, its not worth the hassle.

Also, if you get pulled over and they find you purposely removed the cat and installed a test pipe = $10,000 max fine.
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Old 07-28-2009, 11:09 AM   #7
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Originally Posted by DriveItSideways View Post
I took my cat off for a while and felt noticable gains, nothing crazy but definetly slight gains. If your only street driving I would leave it, its not worth the hassle.

Also, if you get pulled over and they find you purposely removed the cat and installed a test pipe = $10,000 max fine.
I would have to agree. If he wants more power he should replace his entire system.
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Old 07-28-2009, 08:07 PM   #8
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^^obviously replace the whole syste,. but some people are on a budget...think of it this way. cut out the cat, get 80$ for scrap, whp gain and less weight. how could u go wrong?
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Old 07-29-2009, 10:48 AM   #9
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What audi is it?
If its turbo take it off you will see good gains.
If not i doubt you ll notice the gain.
Keep in mind that on some Audis the cats are known to colapse when increased boost is used.
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Old 07-29-2009, 11:31 AM   #10
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When I put a cat back on my car, it gained torque. Go figure.

Leave it on man.
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Old 07-29-2009, 12:09 PM   #11
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^^obviously replace the whole syste,. but some people are on a budget...think of it this way. cut out the cat, get 80$ for scrap, whp gain and less weight. how could u go wrong?
Get pulled over and get a huge fine, that's how. After you pay the fine you would have to install another cat. Sometimes I wonder how some people think.
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Old 07-29-2009, 12:54 PM   #12
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just leave it on or replace it with a freeflow style cat.
Performance cats nowadays are almost like resonators anyways so it doesn't restrict the system compared to a factory cat.
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Old 07-29-2009, 01:07 PM   #13
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When I put a cat back on my car, it gained torque. Go figure.

Leave it on man.
Im gonna report you to PETA. Poor kittahs
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