I realize this isnt exactly what you are asking, but I have a turbo nozzle for my portable pressure washer. It is ideal for tougher stains, like when I acid wash the bay walls and clorox the floors every fall. I use it about half the time, I like it a lot - for tougher stains on hard surfaces, I would not use it on the wood deck. The application to in in-bay should be the same - more cleaning power for the same pressure/flow.
I'll also comment that the first time I took my car through an automatic that had turbo nozzles, I was a bit shocked by the loud sound of the water blasting on the roof, I did not like it. Perhaps thats not the case at most washes, I dont know. Two points I'm trying to make there, a) go drive through one before you make the change; b) make sure you have them sized & distanced properly.