My question is will the Rule pumps have enough suction to draw water from a mushroom through hull? I have problems in my factory setup with the pump "vapor locking" and I have to put some pressure into the scupper (through forward movement) to get the pump to prime. Without a scupper you won't have that ability.
As far as the question about 2 mushroom fittings or a manifold.... The factory manifold won't compete with 3 through hull fittings. If you go with a manifold you will need to increase the diameter of the pipe to compete with the 3 through hulls. My guess is that you would need a good 2 inch manifold (or more). Wake makers could definately answer this question.
2007 Supra 24 SSV 340 CAT
Lake Bryan, TX