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Old 08-19-2002, 06:51 AM
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Join Date: Jul 2002
Location: Amsterdam, Old Europe
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'Empty' cat: louder noise?

At speeds over 80 mph, I notice that the noise of the engine/exhaust gets much louder. Since the cat is nearly 12 years old, I suspect that the cat is now an empty shell only (all catalyst material gone). Could it this 'empty' cat cause this loud noise?

'01 DT41 - M54 - A5S 325Z - 482
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Old 08-19-2002, 07:00 AM
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Join Date: Jul 2002
Location: Trenton, NJ
Posts: 248

I wouldn't assume that the CAT is empty just because of the age. I recently opened up my '87 560SEL and removed most of the material which was very much all there (and very plugged up). There may be a slightly different sound but any increase in volume I suspect to be more due to not quite perfect reinstallation rather than the lack of cat guts

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