yes - search Waldig's videos - he came up with the 2.7GPM for the Bosch stockie in an XFire and then wacked it up to near 4GPM with the CM30 and his Super cooler (less restriction).

Not on the car - he later benched a CM90 as well.....

But if your system has a lot of restriction, even the "huge" CM90 may only achieve 5GPM.

A while ago everyone seemed happy with the CM30, but that may have changed.

I bought a Pierburg CWA50 and it's currently on my test rig doing 22lpm (5.7GPM). Been sitting there for 12months 'cause I've been away for work so much.
I have a stockie Bosch on the car.

See my research graph attach. and a snap of my flow rig. PS - I have a HX as well - not shown
L8tr...the "stock" system curve shown in the graph is a guess based on the 2.7GPM. They are usually parabolic.
Waldig put a flow meter in line to establish the OEM 2.7GPM before he wacked in his Supercooler - not sure if it was 3.8-4GPM just with the supercooler or with the super cooler + CM30. Too lazy to check.

Your final flow rate is where the system curve cuts the pump curve. So you can see you go for the bigger pumps...but if their curve ain't any better at the intersection - you wont get any more flow...you gotta open the system up...as Waldig did with his supercooler. That expands the system curve to the right = more flow.

Another guy by the name of Welwynnick with a Benz S600 - he's done a lot of similar stuff with curves for his
try this....but remember the system curves are for his car...not ours.
and his multipage thread over at MB - here

Nothing like paralysis by analysis....

PS - I run hot water through my rig and use the blower/vac to pull cool air through the IC to work out heat transfer rates.
Waldig did something similar but results are "so far" inconclusive. He has a thread on it though = search

PSS - OBTW....Efficiency - The Pierburg CWA50 pumps twice the [GPM x head] as the OEM Bosch for the same Watts (~50W) = technology (don't get hot) - but also they ain't cheap at $250 up.