As you saw in my last post, I'm having the same problem. When did you buy them? Maybe AMZ is having quality issues. We need to see if others are having the same problem. Have you tested to see what pressure the waste gates start opening. I did and it was lower than the 15 psi they stated. I wonder, if the actuators weren't set correctly then at some pressure the force of the exhaust on the waste gate would be enough to over come the spring pressure in the actuator and let exhaust leak past the turbine.