If you have $10,500 worth of assets and only $9,350 to exempt it, then you are going to lose $1150 worth of assets.
The question calls for actual legal advice specific to your situation (which statute to use to protect your assets), so it is not information you can get on a forum like this either.
I would recommend you hire an experienced bankruptcy attorney to enter an appearance in the case and see if they can help you save your car.
This is exactly the horror story that shows that bankruptcy is about much more than filling out forms. You can easily make the problem much worse and lose more in assets than it would have cost to hire an attorney when you file pro se.
Attorney Jay Perez is a Managing Attorney with Macey Bankruptcy Law / Jacoby & Meyers-Bankruptcy, LLP, a national consumer bankruptcy law firm. His firm can be reached at 888-743-5787 or www.JacobyMeyersBankruptcy.com. Attorney Perez manages offices in Indianapolis, Merrillville, South Bend, Elkhart, Fort Wayne, and Lafayette Indiana. Attorney Perez is licensed to practice before the Supreme Court of Indiana, Federal District Court for the Northern District of Indiana, and the Federal District Court for the Southern District of Indiana. The private law firm of Macey Bankruptcy Law / Jacoby & Meyers-Bankruptcy, LLP is a debt relief agency helping people to file for bankruptcy relief under the bankruptcy code.
This is why you use an attorney. If the Trustee does his job your asset would be sold to pay the creditors for your failure to exempt this properly. The 1150 could have paid an attorney to do it properly. The attorney would have known the limit was 9350 and would have prepared the petition differently. Now that it has been done incorrectly there is not much you can do about it other than write a check to the trustee. I understand we attorneys don't like working for free just like you don't but I have seen a lot lost because you don't have our knowledge.
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I am posting a link to a general description of the exemptions available in all 50 states for you to review. It is unfortunate that you didn't take a look at these laws before you filed so that you would have been aware of the limitations provided by the laws in your state. Hope this perspective helps!