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Audi A4The Audi A4 model offers nimble handling and performance that makes it one of the leading cars in its class. Read more about the Audi A4 in the Audi A4 review.
i called up a company in cali called "labree" they fab'd a 200 cell cat for me that has not givin me any trouble and works/looks very good... look em up... cost me $200 U.S.
i emailed labree motorsports asking the cells count and such on their high flow cats, they emailed back saying its a 400 cell cat. 3 inch inlet and 2.5 inch outlet.