Removing rear bumper and exhaust - jack up or on the ground?

[rojeho]

I'm going to swap a muffler and remove the rear bumper. Does the car need to be jacked up for any reason? It seems like it will be at perfect sitting height just leaving it on the tires?

[maytag]

I find it MUCH easier with it in the air. But I like to work on a creeper when I'm on my back, in the garage.

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[Geof3]

Oh man, not much clearance under there... I’d put it in the air for sure. Could it be done on the ground? Yeah, but up would be much preferred.

[Anker]

It also gets a lot easier to access everything if the rear wheels are off, so put it on jack stands. Also, the rear heat shields, 3 of them, are easy to take of and improve access a lot.