| OEM UD pulley: I think the only difference is 3-rib or 4-rib. If you have an NA PS pulley then buy the 3-rib NA belt but it may require a different length than the OEM belt. Hopefully some others chime in. Don't know the answer for the ATI pulley. Call BDE directly -- he's awesome! Or SpecialtyZ, both recommend ATI. My opinion is ATI pulleys are damn expensive -- I wouldn't recommend unless you've got a very special high $$ build.
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