I have a 1980 cb 750f. I am doing away with the stock airbox and putting k&n single filters on it. My qestion is what to do with the two breather tubes that come out of the crankcase. Should i try and find a filter and run a t tube and run them into that or what? Also I am installing a Vance & Hines 4 into 1 header, do the carbs need to be rejetted oris the stock jets ok. Anyone that can shed some light would be greatly appricated. Also any websites you may know that offers stock and high performance parts would be nice too!!!!!!!!!!!!!!