Alignment or Suspension Related at 100MPH?

MaysEffect

There are several other factors that would cause snap oversteer, not just toe-out in the rear. In most cases, toe out would actually limit snap oversteer or sliding as the inner tire is countering rotation depending on how much toe-out is set. If we are talking about 1 degree from zero, then neither case would be a primary reason for this issue. The Z being a multilink rear setup with rubber bushings like most cars, the design is set to reduce toe-out under load on the outside wheel. If you are getting snap oversteer you are most likely dealing with weight transfer problems.

Unless you have a solid/stiff bushings in the rear, the outer tire in most cases is gaining to in. Increased static toe-in would just create more understeer at the limit.

What was the situation where you were sliding or getting snap oversteer with toe out?