[Blacdout96]

C4 rears had it especially because of the geometry when you brake into a corner, I forget the exact problems, but when you decelerate, the centerline for the suspension is raised too high, and has a tendency to snap the rear, and also changes the camber drastically. granted doing a swap like this would certainly need alot of custom parts, meaning theres no kit that could automatically correct it, hell you could install it right and still have the bad geometry. It's just that I havent heard alot of neg. feedback on C5 IRS sysytems, which would probably don't have alot of the problems the C4 rears had. Once again, even using a rear like that, applying it to our cars could change the geometry.

Edit: Bill beat me to it lol