I've added the attached graph to try to justify our original thread topic...not being hyjacked...note water injection comment on graph.....

Good Point dinsart! Yes flow rate in series will drop, will be interesting by how much, the KC is small - but that may also mean it's tight. There's probably a spec for it - something like 1psi pressure drop at 3gpm or something. 32krazy may already know.

But parallel is not good - since you need to max your differential temperatures....
Let the IC deal with the high load from the charge air cooler and the ambient temps (60-90F) and let the KC deal with the AC temps (35-40). If you ran your KC output through the IC - you've moved closer to ambient and your IC will not perform - lets get the most out of that and the free air flow across it before we demand of the KC.
Delta T is your friend here.

I havent looked at it yet - but flow rate may not be a limiting factor here - that is; if it drops, there is more residence time in the Charge Air cooler to pickup heat and higher AIT's but more time in the IC to dispense the heat (lowering the return coolant temp) - pay peter/paul thing going on. Depends where the major gains are.
There is an optimal calc for this - later.

The attached Graph is "my purely hypothetic attempt" at estimating what's going on here, given what I've read about peoples reported IAT's and some calcs from my intake model (at 14.5psi boost mind you). Laugh as you may....I love this stuff!
The models telling me the stock IAT's should be around 150F at a consistent 4000rpm and the charge air coolers droping about 5kw to achieve this - possibly more if your running at >100mph through the IC on a cool day.

With IC improvements you might be able to lower AIT's by 20-30F for the same rpm (about 7-8kW rejection now), but ambient temps are your foe.

I'm going out on a limb with this one.....but with the KC I'm guestimating 10kW rejection and sub ambient temps near 2500rpm. I love to guess, cant keep my mouth shut - but I hate being wrong...that's my personnal dicotomy...

Also note - 4.5oz of water injection is worth about 5kW to you - so you can see that that would be in KC territory, but you got the O2 depletion thingy going on - hence meth is a +.

apologies for the kW - for those interested 1kW = 3415 BTU's I dont have a real feal with BTU's - prefer kW.