Originally Posted by typos1
They both use the same intercooler, it is is an air to air radiator (as I m sure you know!). Either way it'll decrease the temp of the intake air but, from what you say, mounting them in series would maximise the cooling effect and in parallel would give faster response. But we're still talking increasing intercooler size by 100% if I do it in parallel.
Just to try to put the physics into context; which cools your hand more; putting it under a tap for 10 seconds, or sticking it into a bucket of water for 10 seconds? The bucket contains much more water, but is less effective. If you make the intercooler too big, that's the effect you get. I suspect you'll need to remap it if you modify the intercooler using eitehr approach if you want to gte maximum benefit; I'd strongly advise finding out what your max delivery temperatures are now on a dyno (or ask someone who has tuned one) to see whether it is already big enough....
If you do go down the route of fitting the second i/c, make absolutely sure that you have got the ducting sorted out to actually get cold air through it.