OK, new data point, I fired up the 2002 Aquatrax on the hose and visually there was a marked difference in the quantity of water coming out of the exhaust. The 2002 had more water coming from the exhaust than did the 2004 and the weep hole was not as strong a spray on the 2002 than there was on the 2004. So, now I am thinking that we are not getting enough water out of the resonator into the exhaust. Just have to figure out what to do with this information.