Despite what the service manual says, you cannot get the Y-pipe out of the car at this point. The large three-bolt flange will not pass by the rear catalytic converter and the rear engine mount. In this picture you can see the flange at the left and the rear cat to its right. Notice the “bolts” holding the cat. They do not turn. There are nuts at the top of the bolts. You must remove these nuts to remove the cat. There are four holding the cat to the exhaust manifold. You will be able to see the rear two nuts to remove them, but you must do the front two nuts entirely by feel. Use a high quality 13 mm socket. Use a short extension for the right front nut to lift the wrench above the rear O2 Sensor, the top of which is visible in the picture. There’s just enough room to do this, working from the rear over the crossmember.