I got an engineers certificate a blue slip, and filled out a change of records form. I didnt have to provide any emissions reports etc as others have said, but the engineer did want to see that all the factory emissions gear was connected. I also showed him the sizes of the brakes which other vehicles fitted with the RB30 come with from factory (R31 skyline etc). The R33 has bigger brakes than those so it wasnt an issue, I found it to be a very smooth excersize.