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People have jetters with those specs it is real close to what ron has. I like a higher psi to propell and cut but others like GPM to get good flow. Either way cant really go wrong for the right price. Remember a 13hp engine is common but pumps over 8GPM get spendy so pump condition is the most important part.
I'm buying a new jetter and I'm going for 16 gallons @ 4000psi. The high flow is important but if you are going to jet narrow lines with bends you are going to be using 3/8th and 1/4 inch hoses and with 1600psi you will get a noticable pressure drop on the line and hence a reduced flow.I find I need a high nozzle pressure for cutting roots and soap. I have an old Harben 14gpm @ 4000psi and in Spanish drains I need all the pressure it can give. Invest a bit extra in a warthog nozzle I have both the 1/2 inch and the 3/8th inch and I swear by them, they will give you a better performance out of your machine.