MZ/MuZ Riders

anybody know how much play I should expect in the "floating" front disc on my '01 Skorp Tour? I got chatter noise when braking at highway speeds and pulsation at low speed just before stop. I checked out discs on some Jap sport bikes same kind of float disc arrangement but I found NO play at all on those discs. What do you all think? Do I need a disc? If so any reccomendations as to suppliers?
Any reccomendations for exhaust that will not require rejet and will not be so loud that my neighbors lynch me?
Thanks,
Dave

i'm sure a much more knowledgeable responce is soon to follow,
but from what i learned about brakes, isnt pulsation a sure sign of a warped disk?

I agree it seems logical. But with only 4000 miles I don't quite see how warpage would occur. I am curious as to what I can learn about the looseness in the floating disc.