The way i understand it you have to have your car signed off and get the okay from an engineer when there is a change in engine size. SOooo what happens with a old Escort? The Escort came out in 1300,1600,1800,and 2000 well rs2000 basic same shape.Do you still to go through engineering process. It's the same body.[can understand the change in engine number cos we also have to do that and roadworthy.CHECK this does this chap have to go through the process https://youtu.be/nAaSUAfsMPM Nice car by the way