What does it take to do this? I want to delete the run going thru the transom assemblies.

doesnt take much at all.....unbolt all of your tails from the headers, take off the y pipes that go to the assembly, then put the cover over the hole thats left. Now measure everything and send to cmi for some new tails.....

And get ready to fork over about 5k-7k.....:bunnydance :

I don't think you can pull y pipes without also pulling the engines. But you can cap the y pipe if needed.