The EXP is the type of kite. You don't change the sail per se. The sail is the kite. You can change the rods (3 wrap, 2 wrap, race rod, green race rods) for conditions, but sails are different fabrics, different sewing patterns(i.e. different panel layout) when we're talking about modifying our kites we're usually talking about changing the rods used in the leading edge and upright, changing the bridle, changing the bungees used to hold the rods on, etc.
Sometimes people will take an old sail and make it into a vented by cutting holes in the ripstop or modify it some other way, but the sails usually stay the same. When the conditions permit, we'll change kites from a standard sail to a mid-vent, full vent,
The types of kites/models are EXP (entry level), B series, B pro, New York Minute, etc. Just look at the products section of the Revolution main page to explain the differences.
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