Is it illegal to put a Turbo and Supercharger in your car?

It is not illegal to put a turbo and supercharger in your car. However, there are some restrictions and regulations that you may need to be aware of. For example, some states have emissions laws that may prohibit you from installing certain types of turbochargers or superchargers. Additionally, you may need to make sure that the modifications you make to your car do not affect its safety or performance. It is always best to check with your local laws and regulations before making any modifications to your car.