One jet size for every 3000’ above sea level. When you get there drop to a 280 and play with needle and air screws till it’s good. Obviously bring a cpl jet sizes to cover your ass
Pro Circuit does have a USF approved silencer. There is also the Toomey stuff, but I've just never been a fan of the Toomey performance. You could also do SLP's and I believe JDS is making sparky tips for them.