If you are removing the muffler the rear bumper needs to come off. If you are just doing bypass pipes the muffler and rear bumper can stay. I replaced the muffler and the bolts came off easily. I used liquid wrench on them the day before.
The pipes however were a little more difficult to get apart. Lots of twisting and pulling to get apart. Would have been easier with heat.
If you need directions on removing the rear bumper ( easy ), just ask
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