425, I know you're going through Bob Frederick just like I am. I'm in a similar situation (I'm in Michigan, Bob Frederick is in Ohio). This is what he shared with me on one of my initial emails to him.
Originally Posted by Bob Frederick
The price will be at MSRP plus Temporary Registration/Title and Ohio Doc Fee(Which will total about $275.00). We will also collect Michigan Sales Tax.
You'll want to check with Bob but I'm guessing it's the same for you. Bob will be collecting Michigan Sales tax from me and then I assume I get some sort of "proof of payment" of sales tax to bring to the state to show I paid. I'm guessing Bob's dealership in some fashion passes that along to Michigan.