You'll get a credit for what you have paid already. You just need the proper documentation. I've done the same in the past moving between RI, MA, and CT.

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ON HER WAY OUT: 2009 X5 xDrive48i - Black Sapphire Metallic - Saddle Brown Nevada Leather - Dark Bamboo Wood

ALMOST HERE: 2007 M5 - Silver Grey Metallic (more to come)