Answer
Most manufacturers will take a pump and achieve higher PSI/GPM ratings from it depending on how they build out their washer. You can make adjustments to the engine that allow the pump to operate at a higher PSI/GPM than what is listed by the pump MFG. I wouldn't recommend exceeding the pressure that is listed by the manufacturer, though, if you're looking to independently boost the ratings, as you can damage the pump and potentially hurt yourself.
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