I would say that a one inch difference from one side to the other is far too much. I do own 2 cars that are about 1/4 inch tighter on the right rear. This is like the body was pushed over toward the left side on the chasis. I asked 2 major guys with Porsche what that was all about and they had no answer for me. On the Turbo, I added a 15mm spacer on the right side and a 21mm spacer to the left side so that the wheels were visually in the same place on each side. I have installed the same spacer sizes on other 993 Turbos.