Got a quick responce this time

(thanks)
qurrenly I have 2 L20's running my current setup. That's with a Dtec, a Black Ice, and an astec rad. The astec one restricts the flow a lot, so I want to dump that one, and get 2 extra dtec heatercores.
If I split, it should not hurt the flow that bad. The volume of my rads will give me a good performence.
As I will line them up, this will work better.