I got one of them Magnex R33 exhausts from JW racing the other day...
made it fit my R32 by cutting all the old brackets off it, cutting the rear furthest bracket from the old exhaust, and welding that to the new backbox, about 1.5" from the end... made a new bracket for the centre pipe from some straight steel bar, bent anf welded on to screwinto the original hanger... bit of a struggle... its damn heavy... but it fits...
only prob is that the system is about 2" longer on the R33 so the tail pipes stick out a little far... some time im gonna cut a couple of inches out of the centre and shorten it....