It is a dyno pan so no reason to run a shallow pan when there is room to run a deep one. Usually oil pans work better the bigger they are. Something about the extra volume providing more space for the pumping energy to spread out in I suppose. I don't have test data myself on that theory but plenty of other guys seem to agree that bigger is better when it comes to oil pans. The theory makes sense to me so I just had Charlie build the biggest pan that would fit.