Like Vegas moss said unless you are flying off dirt a air filter is not needed and you have to make your own gasket or use RTV for a sealer. Use locktite on all you mounting screws including the firewall. I install the motor mount and then epoxy the firewall in and all so hit the screws while i doing that. We run 4 tanks of fuel thru the motor for break in so when we go to the field the plane is ready to fly have fun..................