Because of the additional HP I'm picking up with the Cummins re-power, I have to increase the open area for the passive motor and bilge cooling air on my boat project. Thinking of removing the old school cowl vents in the process which seem to be more of a trip hazard when going up to the bow. I've been thinking about something like the air cutouts that sporties frequently use on the side of the hulls. Cutouts through the sides with a filler piece in the center and dorade boxes on the inside to contain/discharge any water that makes it's way in. These style of vents are not louvered to direct air into the engine compartment when under way, so I'm wondering if these boats use a blower system to draw the intake air into the engine compartment? I was also considering those anodized aluminum louvers made by Vetus. Seems like quite a few D.E. boats have them installed. I don't think a blower is required with them when sized correctly. I do have 4 existing vents in the back of the step up into the wheel house, inside the cockpit, but don't want to add any more there for the sake of noise in the cockpit. I'm aware that some guys often use the aft corners of the cockpit to create 45 degree air intakes that run under the deck to the motor compartment but in my case that might not work very well and I'm still exploring that one. What are you using on your boat? Thanks.