Need advice on transom plate removal

[powerplant]

I hope someone can give me a little advice here. I have to rebuild the transom on my Glastron I/O.
I've got the motor out and leg off but I can't seem to get the exhaust Y pipe off. I've located 4 bolts on the pipe and
removed them but the pipe won't budge,is there another bolt that I haven't found ? I can't get to all the transom plate bolts without removing the Y pipe.
Any advice would be greatly appreciated.

 

[salmonkiller01]

Check if there is a 5th bolt in the middle of the flange, mercs have one in the center. I am not positive but IFL should know, been a long time since I worked on an I/O exhaust

 

[powerplant]

Found a fifth bolt ( hex bolt ) under the Y pipe.
Thanks salmonkiller01