the only way they will see an overfueling code is with a box that pierces the pump wire after the electronics , the EZ going pre- electronics should not throw anything , like the VA .
as far as the injectors , they will be able to tell on a test drive , but it can be masked with the TC and VB swap as you can just say that is what is causing the power surge , better TC efficency . you could always get a set of stealth DD1's , more power and if they pull on it will have the correct part number , make them prove you changed injectors , they won't be able to ...