Main point to look 4 on bodywork are.

Fuel cap, they all rust!
Edge of rear bumper where it meets teh arch.
Round front windscreen
Under passengerside door rubber in the bottom right corner
Battery tray
lower edge of tailgate
inside the sunroof channel

easier to tune than ERST to a point, ok the turbos r more expensive an they dnt have LSD, other than that, they r much more rare.