I remember it being something in the 300LPH area. I opted for bosch motorsports/exergy 150's (instead of the 200HPs mu CP3 is capable of handling), as I had plans to keep on the 800HP range after a bigger turbo.
I have put my truck on a dyno once, as no one here will let me use their little dynos and put my 2500 RAM on top of it, plus the guys that have dynos are H&S and Bully dog Dealers and wouldn't like to see a real HP/Torquey truck dismantle their 550HP advertising! Hahaha!
I've hit 900ish on my Drag/Race peak HP, but have done 850something with a lot more flat torque curve with a little milder on fuel tuning though due to lack of air.
I have to find those papers and get the flow to you... I believe it is worth without messing with twin CP3's, plus never had an issue with it and it is my daily driver.
Talking about daily driver, you are right on the turbos. Looking at the factory flow charts at turbodriven.com, there is going to be a big gap looking at the 488's airflow graphic.
I would rather have something with stock down low torque and a good flat curve all the way to the top, so I might just go with a 60 or 62mm/68 with either a 475 or my 366 with a 1.01 turbine housing or something like that.
What do you think?