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If you don't like rasp, and have HFC's, it will only get worse switching to RTPs or just TPs. Sounds like the ART's are the quietest but they won't fit the X because of the transfer case.
^1! Btw there might be a possibility that the new version of ART pipes will work, I guess they just haven't been released yet, I have contacted Hydrazine (motordyne) about it