from what i heard passing the sniffer is pretty easy. if its running well and cat is in good shape. but doubt it will pass visual but i could be wrong
guess it depends on if you know the inspector or they dont do visual. i know like nashville they just sometimes put a mirror under there to see if you got a cat and then put the sniffer in the tail pipe. a stock det runs just as clean as a de i do believe. grab the code book and read see what they require. and ask around see if they do a hood pop visual. go to a shop around there ask the people what they have done with motor swaps...like honda shops or people like the muscle car guys.