Yeah! Zimmermann fo have a web site. It took me abit to find when i was having problems with the 60 pipe i have on my millennium.
The web URl is : http://www.zimmermann-models.com/
Not much information on there other than pipe/muffler dimensions and products listings.
What problems are you having? i have spent a great deal of time getting mine to work properly so i may be able to help you out with it.
Failing that i asked one of the heli guru's here in the UK which i bumped into when i attended a fly-in, he knew straight away wot was causing my problems and all it was was a bad choice of plug and fuel.
One Reason For Crashing'Rogue Servo Bent on World Domination'!!
FLP Flight Team