My big shot I ran 102F and 110N at 7 1/4 lb fuel. I think it was about 325 to 350 hp. I would like to run about 500 I have heard the chart that comes with the plate is not right and their 500 tune up is not really 500. How big of a solenoid do I need? Can I do this with one nitrous and one fuel or do I need 2 of each?