beattie, i think this on a car would be complete waste of time, using coolant of engine to cool the charge would in real terms probably heat the charge, in a boat you have water pickups under the hull to circulate river water through the exhaust,so youd be looking at maybe app 25 degree coolant as opposed to 90 degree engine coolant. the idea of this type of manifold is to actually cool the exhaust gasses/manifold not the inlet charge.