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Old 11-29-2010, 04:41 PM   #1
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Join Date: Feb 2009
Location: Ann Arbor, MI
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Additives? Searching for some info for my Audi

and I came across an additive (Cataclean) that is supposed to clean your catalytic converters to get rid of the dreaded bad cat code 0421.

And I wondered if anyone used any additives that they worked or were worth the price. I have seen good reviews for Techron and Tufoil but have never used them.
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