one has an HFC, one has a straight pipe, one has a resonator...
If emissions is a concern, then get the y-pipe with HFC. If drone or rasp is a concern, then get the y-pipe with the resonator. if you want the loudest sound, get the y-pipe with the straight pipe.
I think that portion of the Y-pipe is interchangeable as well. So if you change your mind, you can switch it out without buying a whole new y-pipe. Hope this helps.
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