> Right but presumably 85% of the parts aren't imported?
85% of parts != 85% of cost
The rules for calculating what percentage of a vehicle is domestic or foreign made are obscure. It's not clear what rules they're going to be using for this tariff exemption yet.
It could be possible that the 15% foreign content of a car could make up 30% of the cost of goods sold, for example. If the parts come from China they could have a 125% or higher tariff applied, pushing the share of BOM cost even higher.