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Join Date: Dec 2004
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Anyone modified an old CAT

1) Can you disable an old CAT without any negative impact?

2) Is there any significant noise impact when replacing CAT with by-pass pipes?

Thanks,
Dan

Old 04-30-2008, 07:26 PM
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sudo apt-get purge 930
 
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Join Date: Jul 2006
Location: Brandon, FL
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Here's a guy who just put a cat bypass in:

I LOST 21 POUNDS but my neighbors are gonna be pissed!
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Mark 1979 930 Euro ***GONE AND DON'T MISS IT AT ALL***

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Old 04-30-2008, 07:32 PM
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I'm a loser, baby.
 
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I just did that. The difference in weight (Bursch bypass) is about 7lbs. I did notice a bit more torque around 3500rpm with the bypass and stock muffler. Sound was basically the same. Check the thread from the previous post for feedback with a cat/muffler bypass setup that I will be finishing tomorrow. Looking for my earplugs now.
You could have the old cat punched out too. Basically the same as the bypass without the weight loss I would think.
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Old 04-30-2008, 07:41 PM
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Really? Taking off a Cat typically reduces torque because you lose "good" backpressure.
Old 04-30-2008, 07:52 PM
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I'm a loser, baby.
 
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I think with the stock heat exchangers, which are supposed to be the more restrictive part of the exhaust system there is back pressure. Again, I am no expert.
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Old 04-30-2008, 08:51 PM
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Southern Class & Sass
 
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If your old cat is plugged, you can empty it out. The interior is three ceramic "bricks". All you need is a steel rod, a hammer, a vacuum, and time.

If your cat is good, you'd be better served to buy a bypass pipe and save your converter for reinstallation later.

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Old 05-01-2008, 03:04 AM
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