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Just an FYI: I installed a cat-back system in my garage using just ramps. The mufflers were the most difficult as the rear valance has to be removed, but the actual X pipe installation was very easy.
You do not need to weld it because it bolts on and off. You may want to change back or do something else in the future. And if you have access to a lift, or a way to get under the car it is easy to do yourself. I did it myself and I can barely screw in a light bulb. And you are going to love that sound!