Mike,
I have thought about changing out the pump to a higher PSI many times, but I worry about not having the amount of vac required to extract the addition water being laid down by the pump, as not only does the PSI go up, but so does the amount of water you put out on the carpet. The system is very well balanced, and my dry times are pretty good with some air movement. I would never tackle commercial resturant carpet...........but for the my business focus (upscale residential) is does very well.