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Just remove the original mufflers and install the NPPs. You'll have to unbolt the brackets for the rear sway bar (4 bolts, I think) and push it out of the way, and drop the center pipes. Using a lift, a friend and I did it in an easy afternoon. This included installing a Mild to Wild switch. Great upgrade. I think I paid about $700 for the NPPs (they were used) including shipping.