If it's just a tailpipe sniffer test, not an inspection for all-original-spec intake/exhaust equipment being present, the Weber 32/36 may well pass easier than the stock Mikuni -- esp. if the latter along with all its feedback gizmos, control box, vacuum lines, etc. aren't all working perfectly.
Here in Tucson we've got a yearly emissions exam with a basic eqpt. inspection (cat & gas cap only) and a tailpipe sniffer, which my Weber swap passes just fine.
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