is there a significant difference handling wise?
The protege's a very stiff chassis. I doubt you'd notice much more than the typical placebo effect unless you were doing some serious road racing... but even then I doubt you'd see the lateral loading to give you the chassis flex to actually see a difference with this.
But then again if you were doing that, you'd have a cage that braced the rear strut towers against the rest of the chassis... so again, not really useful.