Ultimica, that usually only happens when you have a super stretched tire like the guys who are doing the hellaflush thing. But if you're running 215/45/17 on a 17x8, that's a very small stretch but increases the sidewall stiffness to get you a little extra crispness going around a course.
Cyber Evo which is one of the fastest Time attack cars ever built. Stretching tires was necessary to get the proper sidewall stiffness to edge out those extra few seconds.
Where as something like this:
Has much less to do with performance and much more to do with looks.