I do know the difference between the split bowls and one piece bowls. I also know one advantage the split bowl has over the one piece, that being the ability to install a wedge or drop snoot. Other than those two mods, are there any advantages for using the earlier design two piece bowls? Can one install a two piece bowl in a later JE series pump? are there any advantages in top speeds? Or should I just leave my JE series alone, and eventually pay for some custom work ie. blue printing/flowing? I have replaced the original cable driven Jet-o-vator with a hydraulic Place diverter assy. Thanks, Ivan