1. First, you may need to have strong professional knowledge in vehicle engineering and scientific research ability. Then, you can find a modification manufacturer to measure the technical scheme and file it into some papers and patents for publication. This is what you need to prove the reliability of this technical scheme. You think, why does the state restrict the modification of cars because it is afraid of being unsafe? This legal blank can be understood as a "positive list". If you don't write anything outside the list at all, there will be room for what is reasonable to become unreasonable. Now you have to prove that your scheme is impeccable through these things, so the examiner will lose this room. So you need to do a lot of preliminary work, including publishing papers and patents.
2. You need to prepare all these materials, including patent certificates, papers (your own and others'), as well as complete technical plans and drawings, and go to the relevant departments for review. Do not give up applying by various ways of safeguarding rights, such as letters and visits, administrative reconsideration, litigation and petitions. Thought is just stalking and beating. Luo Xiang said, "Public power can only be done if the law says it can be done, while people's rights can be done if the law doesn't say it can't be done." Here, the law doesn't say it can't be done, so you should strive for it.
3. Maybe you should modify and test it first, and bring the test results to prove that your modification is safe when you apply for it at a certain stage.
4. It is suggested that the technical scheme reserve the possibility of quick recovery.