I'm in the process of moving my toilet about 2 feet. After pulling up the floor boards, I found that my main gas pipe was directly in the way. My plan is to cut the copper pipe and put on a Fernco coupling and convert to CPVC. I'd run horizontal for a few inches and then to get up and over the pipe, I thought I'd put in a street 45 attached to another 45 and then go horizontal again until closet bend. Didnt know if that is a no-no though.
(Assume 1/4" slope, 3 inch pipe, and I am under IPC)