exhaust system design for beta 50 hp

[djsaxton]

would greatly appreciate your thoughts.
first my old system see attached (pic 02,52,33)-had 60 hp perkins #4203 repowering with Beta 50hp.
next plan A system (see attached drawing) with two waterlocks drawing.
even with the two waterlocks I don't think they can handle the volume of water in the 9'6 hose. (This is my only waterlock option with my limited space available) my old system makes since to me as there is no way watercan travel from the port side to the STB side muffler. but is a 90 degree bend and aprox 3' rise to much back pressure?

[Cheechako]

Can you just loop up to deck level, 180 turn and down to outlet just inside the transom? Waterlift wherever convenient...? Not only simple but avoids pumping into the system from aft waves at sea or windwaves while at the dock.