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Old 01-23-2007, 04:39 PM   #1
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Join Date: Feb 2005
Location: Chicago
Posts: 283
Stock exhaust/cat question

Just had a cat replaced (under factory 7/70,000 mile warranty, thank god!!) and after seeing what the replacement would have cost me ($1100)!! I started to wonder...

1)Why do we have 4 cats?

2)When 1 goes bad can I expect another to follow in short order (kinda like the O2 Sensors going bad)?

3)The Porsche mechanic says they will only last 60-70,000 miles on most Imported autos due to the computer monitoring the exhaust flows very closely to pass U.S emissions. He says domestics do not have to monitor the exhaust flow as closely because of relaxed standards for U.S. made autos?!?!?! He says this is why most US cars Cats will literaly fall/rot off rather than set a code for reduced performance?!?!?!?!

Food for thought---$1000 per cat at the stealership @4 cats= $4000! Not something to look forward to...
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