"In cooling to 120F the RS4 intercooler drops 75F in 120 seconds. The IPP intercooler drops 65F in 150 seconds."

The vertical black lines are where the fan was turned on. The first black line with stock, IPP above it is the time when the fan was turned on for the stock and IPP IC's. The black line with RS4 above it is when the fan was turned on for the RS4 IC's.

Because the measurements were taken at equal time intervals, if you look at the distance between the data symbols on the lines, you can see that the distance between the symbols on the green line is greater than on the red. That means that over a given 30 second interval the RS4 IC's dropped further in temperature than the IPP IC's.

National Motorists Association