no... posted by StageZ on December 22, 1999 at 04:56 PM
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My last Z...a 91TT passed emissions testing with flying colors with all 4 cats gutted. I didnt use any tricks to pass either... I didnt put in any fuel additives, I didnt pull any vacuum hoses or anything. My numbers were waaaaaay below the limits. If a car is in good mechanical shape then cats are not really needed to make good emissions.