Both are valid point but one thing you have to remember is that it's a LOT easier to pick a Skyline than it is a V8 becuase they could be either a 6 or an 8, you'd have to hear it where as the cops see a P on a Skyline and their eye's light up.
Also another major difference between V8's and Turbos is the power curve, in the wet a V8 puts power down from go so you'd need to regulate the thottle just to get moving but in a turbo you put the foot down and don't find out about it untill you spool up and generally thats too late.