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2000-2005 Discuss your 2000-2005 Bonneville SE, SLE, and SSEi Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-14-2007, 01:36 AM   #1
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Maybe its too soon for anybody to know with the 2000+ cars, but anybody know around when I should expect to replace the cat and muffler on my 2000 Bonneville with 80,600ish miles on it?
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Old 03-14-2007, 01:40 AM   #2
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Well I've got 90,000 miles on mine and they seem to be ok.
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Old 03-14-2007, 03:16 AM   #3
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I am pushing the 100k mark and I think mine is fine i got the high flow ready when it does go
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Old 03-14-2007, 07:23 AM   #4
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The stainless content is extremely high and you probably won't need to consider it for some time. Most S2 folks haven't had to replace yet and that is 95/96
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Old 03-14-2007, 12:48 PM   #5
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I replaced mine at around 125,000 miles.

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Old 03-14-2007, 12:56 PM   #6
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my cat plugged up around 100k

muffler is stainless, should last damn near forever
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Old 03-14-2007, 01:09 PM   #7
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Mines sitting at 121,000 with absolutely no problems.
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Old 03-14-2007, 01:58 PM   #8
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My factory cat went around 103K.
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Old 03-14-2007, 02:56 PM   #9
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My factory cat, at 117k is going now.
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Old 03-14-2007, 03:16 PM   #10
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A well tuned car should never lose a cat. I've had cars past 200K miles w/factory cats.

There was nothing wrong with my factory cat at 140K when I replaced it and noticed no difference (with mods at the time).
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