well i know STS has a CARB EXEMPT number on a few of their units and sevral other kits pending. i look @ Livernois/Detroit Speedworks and theirs says "**Not legal for sale or use on pollution-controlled motor vehicles - For off-road use only**" which i assuem means it will not pass im. the only other kit i can think of off the top of my head is the one from nelson performance but i didnt see anything on the site saying things one way or another.