I read about there newer system. It uses the stock A/C unit to cool the intercooler coolant. Here are some number from an SAE paper on keeping the FGT cool.
a/c condenser 500 btu/min
intercooler 2100 btu/min
So if you assume 100% of the heat removed from the a/c unit was being extracted from the intercooler it would increase the cooling capacity by 24%. Of course 100% never happens and your a/c wouldn't keep you cool then. Also note that any additional heat removed by the a/c condenser flows across the heat exchangers for the intercooler and engine, making them less effective compared to not using the a/c. I find this newer system to be much better than the old one using peltier cooling modules, but I still remain a skeptic for use on a road racing course, but on a dyno pull, street racing, or 1/4 mile one should see some improvement. If you ever looked at a trace of IAT2 you will be amazed at how fast it rises during a WOT pull. The cooling affect won't last long.
The main benifit is cooler IAT2 allow you to run more timing and lowers the parasitic loss from the blower. However running the A/C takes HP, but you can program that to turn off at WOT.