If you have a 150 shot, not hooked up to a progressive system, we have used them in the states for years, you are not going to do your engine, or drive train any favores. Think of it as a big sledge hammer nailing your drive line components all at once. Plus with the cooling effect on your intake charge you can almost double your shot, so a 50 shot will be around 100 once the boost is on.
If you have a small shot like a 50, you really do not need to upgrade anything else, other than making sure you have enough fuel to cover it. If you are thinking of running more, you are going to need buy a direct port system, since the RB26DETT has a very poor design for a single intake shot. When I install mine I will point it into the direction of the turbo, to get a better distribution of the N2O.