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Subject I would assume the aivs helped with the 91 cats, and that
     
Posted by sleepy-z on July 26, 2005 at 9:49 PM
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In Reply To Wrong. '91 cats on a '93 Z. AIV's were deleted as of '93. posted by Dave N on July 26, 2005 at 09:43 PM
     
Message the 93 cats didn't have to have aivs b/c of design. Maybe the 93 engine with the 91 cats causes higher nox, so the redesigned the cats in 93 so they would pass w/out aivs. The problem could be the cats themselves from 91 polluting to much w/out aivs. Just my guess.

     
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