I know Damon (Duratecchie) has a pic of the pipe installed, minus the O2 sensors beening in. With this pic you can clearly see the connection for the felx pipe and the 3" flange is off by a couple of inches. The pic is in the old forums, but I SUCK at the computer, so someone maybe Damon could put up another pic of what I described??
I can't exactly draw a pic of the O2 sensors that were in the wrong place, but maybe this desciption will help. By looking at the pic of the catless y-pipe, on the longer pipe, the O2 sensor that is after where the cat is supposed to be, the 90 degree bend for the smaller pipe is too close to fit the sensor in. The 90 degree bend on the pipe had to be dented a little so the sensor would screw in and not hit the bend on the other pipe.