ok guys im in the process of rebuilding my whole car so money is tight right now i just got the steeda 19 cam and i have gt 40 irons too so i want to put on a new manifold as well to have my uppper half of my engine not stock i eventully want to put on the gt40 tubular intake but i can not afford it right now so something more practical would be explorer intake manifold..so can if i bought the explorer intake mani could i later down the road swap the upper intake with a tubular one? i know in pictures the explorer and tubular lowers look the same could you do this ?