I think it depends on how much pressure you can apply to them before they break.
I have one that works up to a 2.5" hole. I tried to expand a 2.25" but it does not expand the pipe after it reaches that limit. There is still more thread room, but it just doesnt have the power to expand the metal beyond its original form. It does, however, work pretty well at taking the crimps out that get left by the exhaust clamps.
For your application, I think you would need to get pipe that is pre-expanded for a slip system. Though I may just not have the right tooling for it.
Hope that helps