Had some fun today, built a new spreadsheet that calculates what percentage increase you get in flow when you change the jets, either high end and/or low-end. Very interesting. I'm including a picture, I hope you can read it. You put the jets you have now under the proper heading, then enter the jets you plan on replacing them with, and it gives you a percentage of increase or decrease. You only need to enter the jet sizes in the red cells, everything else is calculated.