help with wastegate selection

i think im confused a little, you said i would need at least 2 44mm wastegates with a 4.0L engine. then I said its actually an 8.1L twin turbo which is two 4.0L. so you are saying use 2 44mm per bank which is 4 wastegates which i cant do, so should i use a 50mm or 60 mm on each bank. do you think that would keep pressure down? sorry for the confusion