But why, it seems so pointless. As soon as the dag dag starts the plume of black smoke will give it away, then again depends who they are trying to impress. I wouldn't be able to tell an svr from a none svr but I can tell whether it petrol or diesel.
Someone local to me has a diesel Merc dressed up as a C63 AMG with quad pipes etc. It so obviously sounds like a transit van so I don't know who he is fooling