1) xx4 belts won't fit in an X5, no way no how
2) the xxx4 belt is a fraction wider if any but it is notably longer (to make up difference in wheelbase between xxx4 and xxxs). You must use either a larger tensioner pulley to take up the difference in belt lenth or you can file the tensioner screw holes furthe back, to move the tensioner arm further back to take up the difference in belt length. I think the flat back edge of the belt is thicker which makes it more resistant to skipping., it is also incredably durable.
3) You used to be able to cut every other tooth off the xxx4 belt in the xxx4 cos the pulley were so MASSIVE you still had plenty of teeth in contact to give drive. The X5 has much smaller diff pulleys like the xx4 (lower and better handling) so with every other tooth off I imagine it would skip quite easily. Doesn't sound good other than in an emergency to me.
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Nortech is ACE!
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