Welcome to X5world.

If you use the search feature and type in "Running Boards" you will get a flood of info on the subject . Have fun

Since this is your first post check out the home page. Lots of good reading regarding mods.

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"What you hear in a great jazz band is the sound of democracy. “The jazz band works best when participation is shaped by intelligent communication.”
Harmony happens whenever different parts get to form a whole by means of congruity, concord, symetry, consistency, conformity, correspondence, agreement, accord, unity, consonance…….