The reality would be nothing like the manufacturer's claims.
You could fairly easily increase the jets' pressure to whatever output you want using larger pumps/smaller nozzles. Problems with a set up like this are the moisture and dirt.
Ever look at the inside of a car wash when you are getting your car washed? The walls, equipment, doors, ceiling and floors accumulate algae and dirt build up. Every commercial car wash has a maintenance program for keeping the wash looking good. Skip the maintenance and the wash ends up covered in brown and green scum. I doubt people who install this unit will be happy when, a couple months down the road, they have algae growing and dirt piling up.
Looks good when brand new, though.