I had a few friends in socal run KA-T and for the most part they made custom heatshields and spoke with greddy to obtain their CARB stickers and didnt have a problem with the ref's. LS-1 works as well .... for the most part if you make a swap/kit look stock/clean and run correctly *smog numbers* you wont have too much of a problem.
Here in az I have a friend of mine who just went to smog with his custom KA-T kit on his 96 and passed his smog and doesnt have any codes throwing either. Out here it is a bit more relaxed compared to socal however they do know how to hook up the obd2 port so we dont try anything beyond 95.
In some area's the ref's dont even know what they are looking at... Which can help some... where as others such as the cali ref's know a Sr and Ka difference. Check with a local forum to see what they have to say about smog... it may/may not suprise you.
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