running a two-inch vent though an old header
I have an old 2x2x8 header that has been framed in and is no longer needed to support load. It is hard up against the top plate and cap plate -- no cripples. The framer added another 2x4 underneath as a plate for the new studs underneath the header.
My problem is that I have to get a 2" waste vent through this header and all three plates -- about a 12" bore. How hard is it going to be to bore a 2 1/4" hole through all this? Should I just cut through the header and bore only the top and cap plates? Thanks for your input.