Great to see you managed to get the car engineered, but please dont think this is a get of jail free card as if police want to defect you, engineers report or not, you are going to get defected - and should you adopt the attitude that some people have of "sucked in officer, I have an engineers cert so you cant touch me" you had better be prepared to get reamed from behind
Dont get me wrong, going to the time and effort of getting your car engineered is a good thing, and will keep most police at bay if handled correctly, but as I say just dont be under the illusion that you will be above police attention as sadly its not the case
Best of luck with it