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Not necessarily...
What oil?
How old is it...?
What mods?
Mine is still a bit more clacky than Ted's now that i switched to synth... but it did quiet down a lot as illustrated in the video i posted when i switched. We both have the ae in #8 i think.
Worked on a 2001 ex in seadrift tx that had ad's across the board. Dunno if that was factory... but no R stamps on any of them.