The International CBX Owners Association

Have 81 CBX with single swingarm that does kit allow me to keep the filter box. Airbox is attached to carbs and there is a conical K&N attached to airbox. Wondering if I would be ok with stock jetting or I should replace them ?
Currently carbs are out so would be easier to swap jets if needed

Always had a slight stumble around 4500 rpm with the single K&N. Didn't matter which exhaust was on the bike.
Went away with the stock air setup.