This first shot here is of my pump. It has the one piece bowl.
http://www.***boat.com/forums/attach...1&d=1195149584
This next pic is of an American Turbine split bowl...notice how there's a spot to bolt a droop snoot onto.
http://www.***boat.com/forums/attach...1&d=1195149584
Most people prefer the split bowl because it gives you the ability to mount different size droops on it, as well as wedge it up and down for different handling characteristics, whereas with the one piece bowl you're stuck with what ya got.
Hope this helps.