Exiting diameter of the "droop snoop" is known as the "eye spy" and affects nozzle pressure. So does the shape of the jet pump's intake, known as the "slam ram." That and impeller choice can increase your boats top speed, known as a boater's "speed greed."
Someone more knowledgable in jet pumps may offer a better answer to your question...I'm feeling a bit silly this holiday season.
LO
p.s.: It's called a droop snoot, not a snoop.