I am not sure what is required when doing a top swap, but if you own your own tuner or have access to one I would just start from scratch. You will learn the most this way and you will also know what your tune consists of. The DHP 1.0 is just a basic tune and it works great on some cars and not so great on others. Here is a great place to learn about tuning and it will also help you get a nice bin started Main Page - OpenTuner Notebook