I had a set of bb turbos that I couldnt get apart. I got some of the bolts out and was able to loosen the rest, but couldnt remove all the bolts without turning the chra due to interference with the housings.
Ended up taking them to the local Z guy who used heat and a BFH to get the CHRA separated from the housings. I thought about buying a torch to do it myself, but in this case it was easiest to let him do it for fifty bucks and let him take the risk of ruining something ;-)