Mich. Comp. Laws § 492.135

Sec. 35. Nothing in this act shall be construed to prevent the enforcement in the state of Michigan of an obligation arising from the sale of a motor vehicle made outside of the state of Michigan under an installment sale contract valid in such other state, entered into or executed by the buyer outside of the state of Michigan, whether or not such buyer was a resident of this state or the seller a licensee at the time they entered into such contract.