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1) The X is going to make it louder, and should improve flow on the top end. Better depends on what you are looking for. You will be able to hear the car from a good distance with the X and cans, magnaflows are designed to be loud. However, it shouldnt be obnoxious.
2) No, as you are not touching the cats there should be no difference in emissions (well, save for noise emission)
3) Cut/Weld/Hangers.
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