I was thinking about replacing these and I was wondering if all of them need to be replaced or just the pre cat ones? I dont know if they are bad or not but the car is getting old and I dought they have been replaced before. thanks.
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Just the pre cat ones...the post cat one just deals with cat performance and won't have any effect on performance. Depending on your year you may have one right before the cat too...its useless to replace that unless you are throwing a code.<a href=\"http://www.onid.orst.edu/~waltejam/\" target=\"_blank\">98 Bright Red Camaro</a><br />Too many mods to list....check my website
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