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Krab - Rather than create a new thread, I'll just add to your thread as I just finished the installation of my Magnaflow catback. I noticed the same problem with the rearmost exhaust hanger as well.
The rearmost exhaust hanger on the Magnaflow catback appears to be just a shade "too long" and prevents the rubber donut from easily passing through it (not enough clearance). I found that if you spray some soapy water or lube, it enables the donut to slide through over the hanger (YMMV, of course - mine had just enough clearance where the rubber could deform and pass through onto the hanger).