Update: This is the first time out in 4 years with NO REVERSION problems. I have to say DREW from DREW MARINE is a genius. I bought 2 pairs of shotgun III silencers from them and installed 4 tee fittings 3/4 npt x 3/4 slip x 1/2 npt on the outlets of the aluminum EMI manifolds. Eddie marine made these fittings for me. Then I installed 1/2 npt x 1/2 brass barb fittings and ran heater hose out to 2 water dumps on each side of the boat. I opened the exhaust to the loud mode idled out in the no wake zone and WOW no load up, sounded smooth and even.Amazing..Boat ran great and seemed to have more power also.
Very Happy

Pics to follow

having reversion problems too can you please take pics of how you did your water dumps set up. i have stainless marine exhaust and im having huge reversions problems.

pics please

I had issues also. I now run stainless marine "18 inch tails. I altered the design a bit. I welded close all but two of the water outlets(so i don't burn my swim platform) at the end of the tail. I then made 3/4 inch opening at the top towards the end of the tail and welded a 1 inch bung. Screwed in a 90 and made my discharge out the sides. Problem solved.

is that boat white blue and yellow?