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See where the arrow from #3 is pointing? That's where you want to cut. You don't have to cut the muffler open; you don't even need to remove it from the car. Pull the rear bumper cover, then disconnect the pipes going from the cats to the muffler. Using a cutting wheel on a Dremmel extension, an air chisel, or whatever you can manage to fit into the muffler intake pipe, cut holes in the pipe. Do this on both sides. The more you open it up, the louder it will be.
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