As a tech and automotive geek, I find this interesting and would be interested in a deeper investigation into the legal implications between the manufacturer and hacker (software licensing, etc.) as well as how, if any, existing motor vehicle laws apply.

For context, I drive an old Jeep that has various modifications (AKA lifted, with various accommodations due to that fact) and I've given little thought to any legal ramifications. That said, I do live in state (Colorado) that, legally, has little to nothing to say regarding such modifications, or only addresses them broadly. In contrast, Utah has a number of very specific regulations on such modifications.