I actually have it setup with parallel cooling right now, I figured since I have two 1/2" through hull lines it wouldn't be necessary to run both to the manifold. I have one that runs to a t at the manifold, then the y coming out of the head to a pisser. The other line from the pump runs right into the bottom of the head pipe, then out the top to the stinger with a t to pisser. I was hoping the increased pressure to the pipe would help with the spray pattern and tuning of the pipe, plus if a line gets clogged it should be easier to diagnose.
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