I have a Mac Cat H with 2 high flow cats that is supposed to pass emmissions (haven't tried yet, will know for sure in June), but it kept kicking the check engine soon light on, so I had to put mils eliminators on it to stop that. 99 GT. 
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www.v8stangs.com tech/super moderator.......99 GT Convertable, Gold chrome, S.S. Bumper lettering, Chrome AFS Cobra Rs 03 Cobra IRS, MM mount bushings, C&L maf, true flow inlet, ported intake plenum by Alameda Racing, Mac 70mm tbody, UD pulleys, Steeda timing adjuster, strut tower brace, Bullitt Fuel door, and more.
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