That is partially true.
Bringing out the rear wheels to the same as the front with a 25mm spacer will induce oversteer.
The characteristics I experienced was that the car turned in sharper, and coming out of the turn the rear would throtle out and keep the car from going into oversteer.
I thought the front wheels looked to far tucked in so I bought an 8mm spacer. Installed it on the front. (Needed to be more like .5" for looks)
SO I took the car for a test drive. The wider track in the front made the car grip alot better. It took a bit more push to make the front plow. BUT, it was not oversteer. The rear never came around. It just made the car go where you pointed it. It was less pleasing to drive, even though it handled faster. It seemed to jsut drag teh rear around.
So I took it home, and put the 8mm spacers on the rear with the 25mm spacers, thinking that it would increase oversteer. It did not. It actually increased understeer. And I lost the limits that were obtained with the spacer in the front.
So it would seem to me, that the wheels need to be close to equal in track width. Then the car releys on the suspension setup to determine the over/understeer.
Might explain why the TTE car, and other Scca rally gt4's have the same track width. Also the wider the track the better the grip. That is one reason the wheels shouldgo close to the outside of the fenders. That and it looks good too.
http://www.rallycars.com/Cars/Toyota_GT ... ST185.html