The road worthiness of your modded car is a question between you and the DMV, though. Once you start adding a fifth wheel to your Lada, it's not the manufacture

The road worthiness of your modded car is a question between you and the DMV, though. Once you start adding a fifth wheel to your Lada, it's not the manufacturer's responsibility. (Tesla's software killing people is also not their responsibility, because you're 'supposed' to use it in a way that nobody actually uses it.)