From what I have read ATI manufactures both amps in its So. Cal. facility. I don't know for a fact, but I am guessing Outlaw provided ATI with the specs or design tweaks it wanted and ATI built it to spec. Performance wise, the ATI and Outlaw look very close and I would bet a dollar to a dime that they are more similar than different, but they do not appear to be identical. I'd take either one of them and if and when I ever need external power, I am going to grab which ever one of these I can find at the best price.