I have a long rod big bore Banshee (426) with T5's with a hush kit. The motor has been dune ported with a shaved head (180 psi cranking compression), running 35mm AirStrikers. Set up for running filter pods I am running 158 mains and it is spot on at my elevation (1,000'). To be on the safe side to run the bike where I ride here in Minnesota where we have no dunes I have added an airbox with the proflow kit without the stock cover. What is the rule of thumb for jet size difference for airbox and filter pods. I would like a starting point to jet this bike, one or two jet sizes down, etc???