So just got off the phone with Interchillers.
Basically, his said the ultimate setup is to convert the AC system to an electric unit that ensures it remains activated and chilling during WOT.
He would also leave the air to air intercooler in place so it enables a preliminary cooling effect prior to entering the interchiller. He also recommended going with a water injection kit.
so the interchiller setup is $2,200. the Electric AC unit is $1950 and then ontop of that you'll ned piping, coolant resovoir,
I'd be looking at at least $5500 for a the kit and this exclude time to install, setup and tune it to suit.
He assures me that the setup he sells will bring intake temps down to -20Deg when running on elec pump with engine switched off. then as you get a decent amount of laps done at WOT the temps would increase but they stay within the single digit temp range or close to it.
The other issue there is the added weight. I'd be looking at 35 - 50kg total weight gain. I think the power increase once tuned would be minimal so the power to weight may actually suffer rather than gain.
GOing to talk to my tuning dude about it all and see what he thinks.