I was thinking that the performance of the cooler should not matter because of postitioning due to pressure, but I did not know if the system had high enough pressure. At 80psi, even a plate and fin cooler would fill complete to the top no matter what position. The plates are small enough to restrict the flow and allow the header to fill to the top. Oh well, it is what it is. Can anyone find a speed shop that knows what they are talking about or do I have to call an expert on every aspect of every car I own. GEESH, I wish my level of expertise for my profession had such low standards.