Im trying to find information on a permforming art show that featured
these guys that maybe wore rubber like suits and made themselves into
different objects which I believe that it was named something that
sounded like "mumanchun"?

I believe you are thinking of "Mummenschanz." Here is a description
from a newsgroup post which describes the act:

"Mummenschanz is a Swiss troupe which might be described as clowns or
might be described as puppeteers, but neither would be terribly
accurate. The distinguishing characteristic of their acts is their
costumes which mostly hide the fact that they are humans underneath. 
As various points in this show, they were dressed up a large white
gloves (one person was the left hand, the other the right), large
slinkys (playing with a large balloon), and a slinky creature (four
slinky like appendages attached to a slinky torso)."

Newsgroup Post, rec.juggling
http://groups.google.com/groups?selm=9411082153.AA02457%40bou.shl.com&oe=UTF-8&output=gplain

Here is another description:

"If you hate mime, then you'll love Mummenschanz. The brilliant and
whimsical Swiss company (whose name means "masquerade") brings its
amazingly elastic shapes, blobs, puppets and masks to life in what may
be the most delightful silent show you’ll ever see."

Pepperdine University
http://www.pepperdine.edu/cfa/artists/mummenschanz.htm

The Mummenschanz group has its own Web site, with lots of information,
posters, video, and a T-shirt:

Mummenschanz Home Page
http://www.mummenschanz.com/

I first saw these charming performance artists in the 1970s, when they
made several appearances on "The Muppet Show." Kermit the frog
introduced them as "distant cousins to the Muppets."

My Google search strategy:

Google Web Search: "Mummenschanz"
://www.google.com/search?hl=en&ie=UTF-8&oe=UTF-8&q=Mummenschanz

I hope this helps! If anything I have said is unclear, or if any of
the links do not function, please ask for clarification before rating
my answer.

Cordially,
pinkfreud