Installed SPC camber arms which have been sitting in my garage for a year or two.
I didn't bother to take off the muffler for the passenger side (would've needed a blowtorch or a miracle).
The bolt closest to the rear, I was able to shimmy out with a million or so 45 degree angle turns of a wrench. Still think I would recommend this rather than trying to take off the muffler.
The one closer to the front, i could get with a ratchet no problem.
Gonna take it for an alignment this weekend hopefully, after putting on the front camber bolts as well.