Yes, I searched but I am not finding a direct enough answer. Does anyone know? I'm beside myself on choosing between the WS2 and SP2. I know the WS2 is, but I want to know if the SP2 is as well. I kind like the way the SP2 sounds over the WS2 but in all cases, to lose the heat on my ass, I want the one that is legal for the street, if both are... great, if not WS2 here I come.