A master mechanic at TPiS, Inc. referred me to this product. I think it would be a useful/cheap device to drive down intercooler/intake air temperature from time to time. It is marketed to assist big load rigs with radiator overheating problems that can occur on long grades. It should work just as well cooling an intercooler. Hayden is a well-established name in coolant products; and this product can be found in many auto stores.
The big Jaguar problem with this product is finding space for the water reservoir. I suppose one could use windshield washer reservoir, giving this reservoir a dual-use function.

 

You hit the nail on the head with the limited mounting locations.

I went with this 70 psi pump to two 175 ml/min misters (spraying from left and right) aimed at the inter cooler radiator. I really like this pump because it only uses enough power to keep the pressure at max. So it goes bzzz, wait, wait, wait, bzz, wait wait, meanwhile the misters are spraying a very fine mist at full pressure.

12V Water Pressure Diaphragm Pump High 70 PSI 4 L MIN Caravan Boat RV 4x4 | eBay

And of course a radiator fan to push the mist the right direction when at a stop or going slow:
Radiator Cooling Fan

Works really well!

This video I found randomly on youtube shows a rise of 25c without the spray and only 6c with. a 19 degree C difference!
In American that is:
without spray start 105F, finish 149F, a 44 degree f rise
with spray start 111F, finish 123, a 12 degree f rise

So this particular intercooler spray in this video dropped IATs 32 degrees F

If power increases 1% for every 10 degree f drop, then if you are starting with 400 HP then +3.2% = + 12.8 HP from this mod. That is as much as a set of nameless high flow cats.
That is a very good $ per HP.


This pump location only works if you remove the fog light, which I did so I can plump the coldest air via fog light hole through a 4" flexible dryer duct into my 92mm ProM MAF air open box area
Yes there is lots of other wiring there in the photo: meth injection, low res warning led, meth spraying led, inter cooler spraying led

 

WaterDragon, you don't happen to have a picture with the mist "in action" do you?

 

I'll post a short video in 2 weeks when I have my car back together