I just did this job. Take the pipe off. It’s easier. I use the Stomski tool and had to free up space to get the tool on the studs.
What I also found was I had an exhaust leak, I never saw. So, one thing lead to another. The cross piece needed Mag induction heater and an air hammer, but I got the orig bolts off.
A bit of a pain but a while your there moment.
Covers are blasted and getting Cerakoted