Howdy, i own a 68 classic i would like to upgrade to a lvl X bolt but i see on AGD's web site that i could trade in my old valve to get an X-valve that comes with a lvl X bolt. now i dont know much about the X-valve and was wondering if it's worth paying the 140$ more to get it. what difference will it make performance wise to have the X-valve ??
thx for your answers.
thx for your answers.

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